Posted on September 2, 2018
My relationship with Yosemite rainbows goes all the way back to my childhood, when a rainbow arcing across the face of Half Dome made my father more excited than I believed possible for an adult. I look back on that experience as the foundation of my interest in photography, my relationship with Yosemite, and my love for rainbows. So, needless to say, photographing a rainbow in Yosemite is a pretty big deal for me.
A few years ago the promise (hope) of lightning drove me to Yosemite to wait in the rain on a warm July afternoon. But after sitting for hours on hard granite, all I got was wet. It became pretty clear that the storm wasn’t producing any lightning, but as the sky behind me started to brighten while the rain continued falling over Yosemite Valley, I realized that conditions were ripe for a rainbow. Sure enough, long after I would have packed up and headed home had I been focused solely on lightning, this rainbow was my reward.
The moral if my story is that despite all appearances to the contrary, rainbows are not random—when sunlight strikes raindrops, a rainbow occurs, every time. The reason we don’t always see the rainbow not because it isn’t happening, it’s because we’re not in the right place. And that place, geometrically speaking, is always the same. Of course sometimes seeing the rainbow requires superhero ability like levitation or teleportation, but when we’re armed with a little knowledge and anticipation, we can put ourselves in position for moments like this.
I can’t help with the anticipation part, but here’s a little knowledge infusion (excerpted from the Rainbow article in my Photo Tips section).
Energy generated by the sun bathes Earth in continuous electromagnetic radiation, its wavelengths ranging from extremely short to extremely long (and every wavelength in between). Among the broad spectrum of electromagnetic solar energy we receive are ultra-violet rays that burn our skin and longer infrared waves that warm our atmosphere. These wavelengths bookend a very narrow range of wavelengths the human eye sees.
Visible wavelengths are captured by our eyes and interpreted by our brain. When the our eyes take in light consisting of the full range of visible wavelengths, we perceive it as white (colorless) light. We perceive color when some wavelengths are more prevalent than others. For example, when light strikes an opaque (solid) object such as a tree or rock, some of its wavelengths are absorbed; the wavelengths not absorbed are scattered. Our eyes capture this scattered light, send the information to our brains, which interprets it as a color. When light strikes water, some is absorbed and scattered by the surface, enabling us to see the water; some light passes through the water’s surface, enabling us to see what’s in the water; and some light is reflected by the surface, enabling us to see reflections.
(From this point on, for simplicity’s sake, it might help to visualize what happens when water strikes a single drop.)
Light traveling from one medium to another (e.g., from air into water) refracts (bends). Different wavelengths refract different amounts, causing the light to split into its component colors. Light that passes through a water refracts (bends). Different wavelengths are refracted different amounts by water; this separates the originally homogeneous white light into the multiple colors of the spectrum.
But simply separating the light into its component colors isn’t enough to create a rainbow–if it were, we’d see a rainbow whenever light strikes water. Seeing the rainbow spectrum caused by refracted light requires that the refracted light be returned to our eyes somehow.
A raindrop isn’t flat like a sheet of paper, it’s spherical, like a ball. Light that was refracted (and separated into multiple colors) as it entered the front of the raindrop, continues through to the back of the raindrop, where some is reflected. Red light reflects back at about 42 degrees, violet light reflects back at about 40 degrees, and the other spectral colors reflect back between 42 and 40 degrees. What we perceive as a rainbow is this reflection of the refracted light–notice how the top color of the primary rainbow is always red, and the bottom color is always violet.
Every raindrop struck by sunlight creates a rainbow. But just as the reflection of a mountain peak on the surface of a lake is visible only when viewed from the angle the reflection bounces off the lake’s surface, a rainbow is visible only when you’re aligned with the 40-42 degree angle at which the raindrop reflects the spectrum of rainbow colors.
Fortunately, viewing a rainbow requires no knowledge of advanced geometry. To locate or anticipate a rainbow, picture an imaginary straight line originating at the sun, entering the back of your head, exiting between your eyes, and continuing down into the landscape in front of you–this line points to the “anti-solar point,” an imaginary point exactly opposite the sun. With no interference, a rainbow would form a complete circle, skewed 42 degrees from the line connecting the sun and the anti-solar point–with you at the center. (We don’t see the entire circle because the horizon gets in the way.)
Because the anti-solar point is always at the center of the rainbow’s arc, a rainbow will always appear exactly opposite the sun (the sun will always be at your back). It’s sometimes helpful to remember that your shadow always points toward the anti-solar point. So when you find yourself in direct sunlight and rain, locating a rainbow is as simple as following your shadow and looking skyward–if there’s no rainbow, the sun’s probably too high.
Sometimes a rainbow appears as a majestic half-circle, arcing high above the distant terrain; other times it’s merely a small circle segment hugging the horizon. As with the direction of the rainbow, there’s nothing mysterious about its varying height. Remember, every rainbow would form a full circle if the horizon didn’t get in the way, so the amount of the rainbow’s circle you see (and therefore its height) depends on where the rainbow’s arc intersects the horizon.
While the center of the rainbow is always in the direction of the anti-solar point, the height of the rainbow is determined by the height of the anti-solar point, which will always be exactly the same number of degrees below the horizon as the sun is above the horizon. It helps to imagine the line connecting the sun and the anti-solar point as a fulcrum, with you as the pivot–picture yourself in the center of a teeter-totter: as one seat rises above you, the other drops below you. That means the lower the sun, the more of its circle you see and the higher it appears above the horizon; conversely, the higher the sun, the less of its circle is above the horizon and the flatter (and lower) the rainbow will appear.
Assuming a flat, unobstructed scene (such as the ocean), when the sun is on the horizon, so is the anti-solar point (in the opposite direction), and half of the rainbow’s 360 degree circumference will be visible. But as the sun rises, the anti-solar point drops–when the sun is more than 42 degrees above the horizon, the anti-solar point is more than 42 degrees belowthe horizon, and the only way you’ll see a rainbow is from a perspective above the surrounding landscape (such as on a mountaintop or on a canyon rim).
Of course landscapes are rarely flat. Viewing a scene from above, such as from atop Mauna Kea in Hawaii or from the rim of the Grand Canyon, can reveal more than half of the rainbow’s circle. From an airplane, with the sun directly overhead, all of the rainbow’s circle can be seen, with the plane’s shadow in the middle.
Not all of the light careening about a raindrop goes into forming the primary rainbow. Some of the light slips out the back of the raindrop to illuminate the sky, and some is reflected inside the raindrop a second time. The refracted light that reflects a second time before exiting creates a secondary, fainter rainbow skewed 50 degrees from the anti-solar point. Since this is a reflection, the order of the colors is the secondary rainbow is reversed.
And if the sky between the primary and secondary rainbows appears darker than the surrounding sky, you’ve found “Alexander’s band.” It’s caused by all the light machinations I just described–instead of all the sunlight simply passing through the raindrops to illuminate the sky, some of the light was intercepted, refracted, and reflected by the raindrops to form our two rainbows, leaving less light for the sky between the rainbows.
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Posted on April 11, 2018
Are you insane?
Albert Einstein defined insanity as doing the same thing over and over, but expecting different results. Hmmm. For some reason this reminds me of the thousands of good landscape photographers with hundreds of beautiful images they can’t sell. These photographers have a good eye for composition, own all the best equipment, know when to be at the great locations, and are virtual gurus with state-of-the-art processing software. Yet they haven’t achieved (their definition of) success.
Conducting photo workshops gives me pretty good insight into the mindset of serious amateur photographers, the photographers serious enough to spend time and money to rise before sunrise and stay out after dark to photograph the world’s most beautiful landscapes in frequently miserable conditions. I’m struck that many of these photographers have serious aspirations for their photography, but are so mesmerized by technology that they turned over control of the most important aspects of their craft to their camera. Their solution to photographic failure is to buy more equipment, visit more locations, and master more software. But the most overlooked tool is the one on top of their shoulders.
Knowledge vs. understanding
Just as a new camera won’t make you a better photographer, simply upgrading your photography knowledge won’t do it either—knowledge is nothing more than ingested and regurgitated information. Understanding, on the other hand, (among other things) gives you the ability to use information to create new knowledge and solve problems.
Many photographers invest far too much energy acquiring knowledge, and far too little energy understanding what they just learned. For example, it’s not enough to know that a longer shutter speed or bigger aperture means a brighter image if that knowledge doesn’t translate into an understanding of how to manage motion, depth, and light with your camera. It’s one thing to know you need more light on your sensor, but something altogether different to know whether to add it with a longer shutter speed, larger aperture, or higher ISO—a choice that makes a huge difference in the finished product.
Automatic modes in most cameras handle static, midday light beautifully, yet struggle in the limited light, extreme dynamic range, and harsh conditions that artistic photographers seek. The auto modes have become so good that they have created the illusion of control in the minds of many photographers. I see many excellent photographers whose profound faith in their technology has caused critical deficiency of two fundamental photographic principles:
Books and internet resources are a great place to start learning these principles (here’s my Photo Tip article), but the knowledge you gain there won’t turn to understanding until you get out with your camera and learn to manage a scene’s motion, depth, and light in creative ways that set your photography apart.
My metering philosophy is to approach every scene at ISO 100 (my Sony a7RIII’s best ISO) and f/11 (the best combination of lens sharpness and depth of field with minimal diffraction)—I control the light with my shutter speed and only deviate my baseline ISO and f-stop when the scene variables dictate. For example, when I want more or less depth of field, I’ll choose a different f-stop, or when I can’t get a proper exposure at the shutter speed that gives me the motion effect I want (blurred or sharp), I’ll adjust the ISO.
This Yosemite sunset from last February was about Half Dome, the clouds, the light, and the reflection in the Merced River. After finding my composition, the scene variables to consider when determining my exposure settings were:
The blur effect I wanted would require at least a one second exposure time, so I dropped my ISO down to 50 (as low as it goes). Keeping my aperture at f/11, I dialed my shutter speed with an eye on the histogram—when the histogram indicated I’d pushed my highlights as far as I could without clipping, my shutter speed was 1 second. This gave me a the proper exposure with sufficient motion blur, but I decided a little more motion blur would be even better. To double the shutter speed to 2 seconds, I stopped down one stop to f-16 and tried one more frame. In this case the benefit of the extra motion blur far outweighed any diffraction and lost sharpness (which experience has shown e would have been minimal with my Sony 16-35 GM lens), so that’s the frame I selected.
Insanity is in the mind of the beholder
If landscape photography gives you what you want, then by all means, continue doing what you’re doing. But if you’re having a hard time achieving a photographic goal, the solution is likely not doing more of what you’re already doing. Instead, try reevaluating your comprehension of fundamental photographic principles that you might not have thought about for years (or ever). Get out of your camera’s auto exposure modes and take control of your scene’s variables. You’ll know you’re there when you know how to get the result you want, or know why it’s simply not possible.
Do I really think you’re insane for doing otherwise? Of course not. But I do think you’ll feel a little more sane if you learn to take more control of your camera.
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Posted on January 28, 2018
The downside of turning your passion into your profession is that so many decisions are no longer based on the pleasure they bring. Since my early 20s, I’d been very happy as an amateur photographer, picking my photo destinations and the images I clicked for the sheer joy of it. But I knew becoming a professional photographer risked preempting that joy with photography decisions designed to pay the bills.
For that reason, part of my decision to become professional a dozen or so years ago included a personal vow to only photograph what I want to photograph, and to never take a picture just because I thought it would make money. I was able to blend my years of photography experience with my prior career in technical communications (tech writing, training, and support) to create a photography business based on photo workshops, not image sales. Of course I do sell images too, but I’ve always viewed image sales as a bonus rather than something to something I rely on.
I’m thinking about this right now because this image reminds me how little time I actually have to work on my images. I’d totally forgotten about this afternoon from last April, when a storm cleared to reveal a dusting of fresh snow on the granite surrounding Yosemite Valley. As we stood marveling at the majesty, a ray of sun burst through the clouds to paint a vivid rainbow in the mist gathered beneath Bridalveil Fall.
It’s finds like this that remind me of the hundreds (thousands?) of images waiting to be processed and shared, some going back more than ten years. This isn’t a complaint—I can’t image a better life than mine. In fact, instead of lamenting the inability to reap the fruits of my labor, I find comfort in the knowledge of these images’ existence. Even if I never process and share them, they’re a reminder of my good fortune. If there’s a lesson here, maybe it’s that, for me at least, the true joy of photography isn’t the images and the acclaim they evoke, it’s simply the act of capturing them.
Posted on January 7, 2018
I used to resist using the supermoon label because it’s more of a media event than an astronomical event, and it creates unrealistic expectations. But since the phenomenon appears to be with us to stay, I’ve changed my approach and decided to take advantage of the opportunity to educate and encourage.
What’s the big deal?
So just what is so “super” about a “supermoon?” Maybe another way of asking the question would be, if I hadn’t told you that the moon in this image is in fact a supermoon, would you be able to tell? Probably not. So what’s the big deal? And why do we see so many huge moon images every time there’s a supermoon? So many questions….
Celestial choreography: Supermoon explained
To understand what a supermoon is, you first have to understand that all orbiting celestial bodies travel in an ellipse, not a circle. That’s because, for two (or more) objects to have the gravitational relationship an orbit requires, each must have mass. And if they have mass, each has a gravitational influence on the other. Without getting too deep into the gravitational weeds, let’s just say that the mutual influence the earth and moon have on each other causes the moon’s orbit to deviate ever so slightly from the circle it seems to be (without precise measurement): an ellipse. And because an ellipse isn’t perfectly round, as it orbits earth, the moon’s distance from us depends its position in its orbit.
An orbiting object’s closest approach to the center of its ellipse (and the object it orbits) is at “perigee”; its greatest distance from the ellipse’s center is “apogee.” And the time it takes an object to complete one revolution of its orbit is its “period.” For example, earth’s period is one year (365.25-ish days), while the moon’s period is a little more than 27 days.
But if the moon reaches perigee every 27 days, why don’t we have a supermoon every month? That’s because we’ve also added “syzygy” to the supermoon definition. In addition to being a great Scrabble word, syzygy is the alignment of celestial bodies—in this case it’s the alignment of the sun, moon, and earth (not necessarily in that order). Not only does a supermoon need to be at perigee, it must also be syzygy.
Syzygy happens twice each month, once when the moon is new (sun-moon-earth), and again when it’s full (sun-earth-moon). (While technically a supermoon can also be a new moon, the full moon that gets all the press because a new moon isn’t visible.) Since the earth revolves around the sun as the moon revolves around earth, the moon has to travel a couple extra days each month to achieve syzygy. That’s why the moon reaches perigee ever 27 days, but syzygy comes every 29.5 days, and the moon’s distance from earth is different each time syzygy is achieved.
The view from earth: Supermoon observed
While perigee, apogee, and period are precise terms that can be measured to the microsecond, a supermoon is a non-scientific, media-fueled phenomenon loosely defined a moon that happens to be at or near perigee when it’s full. To you, the viewer, a full moon at perigee (the largest possible supermoon) will appear about 14% larger and 30% brighter than a full moon at the average distance. The rather arbitrary consensus definition of the distance that qualifies a moon as a supermoon is a full moon that is within 90 percent of its closest approach to earth.
I really doubt that the average viewer could look up at even the largest possible supermoon and be certain that it’s different from an average moon. And all those mega-moon photos that confuse people into expecting a spectacular sight when there’s a supermoon? They’re either composites—a picture of a large moon inserted into a different scene—or long telephoto images. I don’t do composites, but they’re a creative choice that I’m fine with others doing as long as they’re clearly identified as composites.
For an image that’s not a composite, the moon’s size in the frame is almost entirely a function of the focal length used. I have no idea whether most of the moons the full moon gallery below were super, average, or small. The images in this and my previous blog post were indeed super, taken within minutes of each other last Sunday evening, at completely different focal lengths.
Every full moon is super
A rising or setting full moon is one of the most beautiful things in nature. But because a full moon rises around sunset and sets around sunrise, most people are eating dinner or sleeping, and seeing it is usually an accident. So maybe the best thing to come of the recent supermoon hype is that it’s gotten people out, cameras or not, to appreciate the beauty of a full moon. If you like what you saw (or photographed), mark your calendar for every full moon and make it a regular part of your life—you won’t be sorry.
Click an image for a closer look and slide show. Refresh the window to reorder the display.
Posted on January 4, 2018
A man with a plan
It was New Year’s Eve and I was perched on a cliff overlooking Yosemite Valley, two feet from certain death and ten minutes from the rise of the largest full moon of 2018. While the death thing would have only been a problem if I’d have lost my mind, the moon’s appearance was entirely subject to the whims of Nature. And at that moment, she wasn’t cooperating.
The vast majority of my images are the result of a plan. But planning in nature requires both flexibility and resolve—an ability to adjust and persevere rather than quit when things don’t unfold as expected.
The master plan for this trip was to photograph 2018’s largest moon twice, on opposite sides of the Sierra. I’d start with super-telephoto shots of the moon’s appearance above Yosemite Valley at sunset on December 31, then drive to Lone Pine (just 100 or so miles as the drone flies, but more than 350 miles as the car drives) to capture its disappearance behind Mt. Whitney at sunrise on January 2. Unfortunately, it seemed that each day leading up to my trip, the weather forecast for both locations trended worse. But moon or not, can you think of a better way to celebrate the New Year than circumnavigating the Sierra? Me neither.
Assembling the parts
A beautiful scene is one part landscape and one part conditions (light, weather, and so on). We generally know where the great landscapes are, but finding them in the right conditions requires research, planning, and execution (plus a little luck). I try to time my trips, workshops and personal, to coincide with these special moments, usually some weather or celestial event. Whether it’s lightning at the Grand Canyon, the Milky Way above Kilauea or the bristlecone pines, or a moon rising or setting behind Half Dome or Mt. Whitney, I want to be there.
The problem is, nothing in nature is guaranteed. We know to the microsecond where the sun, moon, and stars will be at any given time, but have no way of knowing what weather we’ll encounter. I’ve lost many a shoot to inconveniently placed clouds, and I’ll never forget the time I scheduled an entire Yosemite workshop based on the anticipated arrival of Comet ISON, only to have the comet go all Icarus on me just days before the workshop.
But experience has taught me that regardless of the score you don’t leave the game until the last out, and you don’t cancel just because the odds are against you. Sometime the odds are wrong, and sometimes I end up getting an unexpected gift that feels like a reward for my persistence. One of the most memorable shoots of my life happened on a morning with clear skies forecast, but we ignored the forecast and went out for sunrise anyway. And I ended up getting the last laugh on the ISON workshop when Yosemite Valley became the beneficiary of a snowstorm and sudden cold that coated every exposed surface in sparkling ice crystals.
Meanwhile, back on the ledge…
It turns out that my Sierra circumnavigation didn’t yield the big moon images I’d planned, but it definitely delivered in many ways. Ignoring the clouds, I arrived in Yosemite Valley on New Year’s Eve afternoon and ended up at my chosen location at around 4:00 p.m. The sky was mostly clouds, but a few patches of blue in the east gave me reason to hope.
The spot I’d chosen was indeed on a cliff 300 vertical feet above Yosemite Valley, but it was only dangerous if I wasn’t paying attention to what I was doing, and given my relationship with heights, there was little chance of that. Flanked by two tripods, I kept one eye on the horizon and the other on void at my feet. On my big tripod (RRS TVC-24LS) was my Sony a7RIII and 100-400 GM with a 2x teleconverter; on my compact tripod (RRS TQC-14) was my Sony a7RII and 70-200 f/4. Each tripod had one leg about two inches from the edge and two legs in the shrubs at my back. Me? I had two legs firmly planted on the narrow granite shelf, with my backside hugging the shrubs.
Sunset was at 4:50. With a cloudless sky the moon would appear from behind Cloud’s Rest at around 4:30, a location similar to last month’s full moon but closer to El Capitan. I’d hoped to start the moonrise with a long telephoto, then transition wider as it rose, but by 4:20 the persistent clouds made it pretty likely that if I saw the moon at all, it would be well above Cloud’s Rest and too high for a telephoto shot. At around 4:30 I waved a white flag at the big moon idea and replaced the 100-400 lens with my Sony/Zeiss 24-70 f/4, hopeful that the moon would make its way into a gap in the clouds before the sky became too dark. At around 4:45 the moon teased with a brief appearance between the clouds, but they scissored shut before the moon had an opportunity to shine.
While waiting I worked on my revised composition, which was complicated by my desire to include with the distant moon and Yosemite Valley, a dead tree in my immediate foreground. With very little margin for depth of field error, I opened my hyperfocal app and plugged in the numbers to determine the f-stop and focus point that would ensure front-to-back sharpness. With that out of the way, I bided my time photographing beautiful warm light on El Capitan and Half Dome.
The moon finally peeked above the clouds for good at 4:48. Ascending the darkening sky, the moon was enhanced by a sheer film of nearly transparent clouds that started out pink that intensified to fuchsia on their way to a vivid magenta that colored all of Yosemite Valley. I kept clicking as the foreground darkened, magnifying my image periodically to be sure I wasn’t losing detail in the moon. The image I share here was captured fifteen minutes after sunset.
You win some and you lose some
The Lone Pine segment of my trip was a photographic flop, but photography really shouldn’t be all about the photography. I arrived in Lone Pine mid-afternoon on New Year’s Day and spent the remaining daylight doing reconnaissance for the next day’s sunrise moonset. This was going to be another super-telephoto opportunity, this time at a location I’d driven past but never photographed from, so I wanted to ensure no surprises. That afternoon I enjoyed nice clouds and light above the Sierra’s east face, but to have photographed it would have compromised my scouting objective so I was just content to enjoy.
I rose before 6:00 a.m. on January 2 and drove out to my planned location with a pretty good idea that the clouds would shut me down. When I parked, the moon penetrated the clouds as an indistinct glowing sphere. As I waited, it descended into more-dense clouds and disappeared for good, but I stayed, quite content to simply watch Mt. Whitney and its towering neighbors emerge beneath the brightening sky.
The drive home took my beneath the serrated Sierra crest, past Mono Lake, through the Hope Valley, over Echo Summit and back down into Sacramento, completing the circuit with at least one successful image and many memories of a great trip. A very Happy New Year indeed.
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Posted on December 19, 2017
This month’s Yosemite Winter Moon photo workshop group got the rare opportunity to photograph a full (or nearly full) moon rising above Half Dome at sunset on three consecutive nights. One reason it’s rare is that, as viewed from Yosemite Valley, the full moon and Half Dome only align in winter. But the real tricky part is making it happen three times when sunset happens at pretty much the same time each evening, but the moon rises about 45 minutes later.
My goal for photographing a rising full moon is to get the moon on the horizon in the window from 15 minutes before to 15 minutes after the “official” (flat horizon) sunset. Earlier and there’s not enough contrast and the moon looks bland; later and there’s too much dynamic range to capture detail in the dark landscape and daylight-bright moon.
The key to making this work starts with understanding that when you see a sunset or moonrise time published for a location, that time is always based on a flat horizon. So unless you’re atop a mountain or on a ship at sea, you’ll probably see the sun disappear behind the terrain in the west before sunset, and you’ll probably need to wait for the moon to rise above the terrain in the east.
Since the sun is at my back when a full moon rises, I’m not too concerned about the precise timing of the sun’s disappearance. But I need to be pretty dead-on for the moon’s arrival. Knowing the moon will rise an 40-60 minutes (or so) later each day, it’s easy to infer that the more days until the full moon, the higher the moon will be at sunset. Sadly, I have no control over the timing of the absolute sunset/moonrise, but I can control the elevation of the horizon, and therefore the moon’s appearance on a given day, by choosing my position relative to the horizon above which the moon will rise.
To make this workshop’s consecutive moonrises work, each evening I picked a view that was farther from Half Dome than the previous evening. On our first evening I chose a spot on the east side of Yosemite Valley; the next evening we were closer to the middle of the valley; on our the third evening our vantage point was near Tunnel View, at the opposite side of Yosemite Valley from Half Dome. The moon rose later above the flat horizon each evening, but by moving farther away, we reduced the distance the moon had to travel before it appeared.
Big moon, small moon
The other thing this little exercise illustrates is how to make the moon big in your frame. Notice that in each image, Half Dome is more or less the same size, but the moon gets progressively bigger. That’s because on any given day, no matter where I am on Earth, the moon is so far away that its apparent size doesn’t change. But the size of earthbound features, like Half Dome, changes a lot with proximity. When I was on Yosemite Valley’s east side for the first moonrise, filling my frame with Half Dome required just a little more than 100mm; the next night I was far enough back to require about 250mm to fill the frame; and on the final night, from eight miles away I needed more than 500mm. And as my focal length increased, so did the moon’s size in my frame.
Posted on December 5, 2017
Large or small, crescent or full, I love photographing the moon rising above Half Dome. The alignment doesn’t work most months, so those months when the alignment is right, I do my best to be there.
For last week’s Yosemite Winter Moon photo workshop I’d planned three moonrises: Thursday and Friday we got lucky with the never reliable December skies, but Saturday night concerned me. Not only was this moonrise the “main event,” the forecast was less than promising. And while the first two moonrises were absolutely beautiful, the moon was less full and we were on the valley floor, much closer to Half Dome. Our location required a wider focal length that meant a relatively small moon. But on Saturday (it would rise too late to photograph on Sunday) the moon would be 99 percent full and rise shortly after sunset, just left of Half Dome when viewed from Tunnel View. Tunnel View is eight miles west of Half Dome, a distance, when combined with the moon’s proximity to Half Dome, that would allow a long telephoto that would fill the frame with the moon and all of Half Dome.
Saturday started clear, but soon a thin layer of clouds moved in, bathing Yosemite Valley in diffuse light that was wonderful for photographing pretty much anything that didn’t involve the sky. These clouds weren’t dense enough to completely obscure the sun, but with a chance of rain coming overnight, I knew they’d be thickening at some point.
I got my group in position near Tunnel View about a half hour before sunset. I’ve attempted moonrises that were completely obscured by clouds, and some where we could see the moon’s glow through the clouds, but no detail. I tried to stay positive but the fading light made it impossible to tell exactly how thick the clouds were. Fearing the worst, I rationalized that we’d already had two nice moonrises and maybe wishing for a third was just greedy. But still….
Hoping for the best, I pointed out where the moon should appear about ten minutes after sunset, advising everyone to continue shooting normally until then, but to have an idea of their moonrise compositions. Practicing what I preach, I got out my Sony 100-400 GM, added my 2x teleconverter, and framed up the scene. Because I wasn’t going to shoot anything else (as you may have noticed, I already have a couple of Tunnel View images in my portfolio), I focused and waited.
About five minutes after sunset an amber glow in the clouds next to Half Dome signaled the moon’s imminent arrival. That we could even see any sign of the moon gave me hope and I held my breath as the glow intensified, still unsure whether we’d see lunar detail or just a white blob. The glow was actually unique and very beautiful in its own way and I started clicking. The instant the moon’s brilliant leading edge nudged into view, silhouetting the trees, I knew we were in luck. The landscape was already fairly dark by then, but because this was the group’s third moonrise, they’d become old pros at dealing with the scene’s extreme dynamic range—at that point the workshop’s mantra had become: “Push the exposure until the moon’s highlights start blinking, and fix the shadows in Photoshop.”
The experience that evening was even more spectacular than I had dared hope, a perfect storm of conditions I might never see repeated: the moon’s alignment with Half Dome, the telephoto distance, the timing of the moon’s arrival that put it on the horizon with just enough twilight remaining, and (especially) the translucent clouds that enveloped the moon in a golden halo and eased the scene’s dynamic range.
Some thoughts on the Sony a7RIII
A couple of weeks ago, at a Sony sponsored event in Sedona, I got the opportunity to do some night photography with the new Sony a7RIII. But this Yosemite trip was my first time using the new camera on my own. It’s too soon for any final proclamations, but my general sense is that this camera has even more dynamic range than the a7RII (which is pretty incredible). The other significant takeaway from this weekend is that I used the same battery for three-and-half days and came home with more than 25 percent remaining. Anyone who shot with the a7RII, knows how significant this is.
I’m still getting used to the new camera’s interface—while similar to the a7RII, there are definite differences. I do like the new button layout and improved menu interface, but am still getting used to the joystick and touchscreen—pretty sure I’ll learn to love them too. And the dual card slots are a necessary and most welcome improvement.
My biggest complaint with the new camera is that the back-button focus that I loved so much on the a7rII is broken on the a7RIII. Every camera I’ve ever used (Canon and Sony) has allowed me, after tweaking some settings, to switch seamlessly between auto and manual focus without requiring me to change the focus mode. So the first thing I do when I get a new camera is disengage autofocus from the shutter button and assign autofocus to a button on the back of the camera. With back-button focus enabled, my workflow has always been manually focus by default, but always with the ability to autofocus with the simple push of a button—no focus mode change required. Doing this with the a7RII was the easiest of any camera I’ve ever used, but for some reason Sony changed the focus behavior of the a7RIII, so now I have to deal with the added step of switching focus modes on the camera before focusing. This might not sound like a big deal, but I don’t want to have to think about my camera when I’m composing a scene, so this behavior is extremely frustrating. That said, I’ve already communicated my frustration to Sony’s engineers and am hopeful (confident?) this is a firmware fix that will come soon. Sony’s responsiveness to things like this is one of the reasons I’m so happy I made the switch from Canon.
I’m happily retracting those words after Sony found a solution for the a7RIII back-button focus problem. At last month’s Sony media event Sedona, I was surrounded by Sony’s best and brightest engineers; when I brought the BBF problem to their attention, we all scratched our heads over how to make it work, and they finally asked me to send them a detailed write-up. They promised to address it ASAP, but I didn’t think it would happen without a firmware update.
To enable back-button focus on a Sony a7RIII or a9, simply assign any custom button (Tab 2, Screen 8) to the AF/MF Control Hold option (AF1 screen). To use BBF, keep the camera in Manual Focus mode—this allows you to manually focus with the focus ring, or to autofocus by pressing whatever button you assigned AF/MF Control Hold.
I’m pretty sure this is the best camera I’ve ever had my hands on. In fact, the dynamic range improvement was obvious as soon as I started processing this moonrise shoot—we continued shooting about 25 minutes after sunset, and just a little processing reveals useable detail in my highlights and shadows, even in my final image. Ridiculous.
A couple of full moon photography tips
Sun and moon rise/set times always assume a flat horizon, which means the sun usually disappears behind the local terrain before the “official” sunset, while the moon appears after moonrise. When that happens, there’s usually not enough light to capture landscape detail in the moon and landscape, always my goal. To capture the entire scene with a single click (no image blending), I usually try to photograph the rising full moon on the day before it’s full, when the nearly full (99 or so percent illuminated) moon rises before the landscape has darkened significantly.
The moon’s size in an image is determined by my focal length—the longer the lens, the larger the moon appears. Photographing a large moon above a particular subject requires not only the correct alignment, it also requires distance from the subject—the farther back your position, the longer the lens you can use without cutting of some of the subject.
This moonrise image is a perfect example. Tunnel View in Yosemite is one of my favorite locations to photograph a moonrise because it’s about eight miles from Half Dome. At this distance I can use 500+ mm (250mm plus a 2x teleconverter) to fill my frame with Half Dome—with the moon nearby, I get an image that includes all of Half Dome and a very large moon.
Click an image for a closer look and slide show. Refresh the window to reorder the display.