Yosemite Spring

Moonbow, Lower Yosemite Fall, Yosemite
Sony a7RIII
Sony 12-24 f/4 G
10 seconds
F/4
ISO 1600

There are many (many!) beautiful sights in Yosemite, but when most people think about Yosemite, they think about waterfalls and granite. The granite is forever (virtually), but Yosemite’s waterfalls come and go with the season: exploding from the granite walls in spring, most of Yosemite’s waterfalls are bone dry by summer’s end. And some years are better than others—three springs ago, Bridalveil and Yosemite Falls were barely a trickle, too dry to photograph (unprecedented in my lifetime). The next spring the deafening roar of waterfalls was back, echoing throughout Yosemite Valley.

Moonbow, April 18, 2019

I just returned from my annual Yosemite Moonbow and Dogwood photo workshop on Friday night (technically, it was early Saturday morning). The dogwood are just starting to pop, but the waterfalls are going strong, with enough snow in the high Sierra bank to keep them roaring through summer.

My group photographed more waterfall rainbows than I could count, on both Bridalveil and Yosemite Falls, but the highlight was Thursday night’s lunar rainbow (moonbow) shoot on the bridge beneath Lower Yosemite Fall. Nothing compares to the first time seeing a moonbow. A shimmering silver arc, a moonbow is clearly visible to the naked eye—proper exposure in a camera reveals the moonbow’s vivid color.

A “practice” moonlight shoot the previous night helped prepare everyone for the difficulties of photographing in the dark. And while my group came prepared for moonlight photography, the crowds and mist make things difficult even for the seasoned veteran. The crowds weren’t too bad this year, but while lots of water in the fall means a better moonbow, it also means a wetter photographer.

I feared that the thin cloud cover that had delivered a spectacular sunset just as the full moon rose just an hour or so earlier, would douse the moonlight necessary for a moonbow, but that turned out to be a non-factor. One problem was contrails, more than I’ve ever seen. Some chose to leave the sky (or most of the sky) out of their frame; I opted to include the sky, then carefully execute a contrailecotmy in Photoshop.

Because most of my time on the bridge is spent assisting the group, I only got to click a handful of frames. I started on the (drier) paved open area before the bridge, but after working with a workshop participant on the bridge, I decided the view there was worth getting wet.

I went wider with this year’s images than previous years, using my Sony 12-24 G lens on my Sony a7RIII camera. I focused on the moon, then turned around and set up my composition. Concerned about too much water on my front lens element, I bumped my ISO to 1600 to keep my shutter speed at 10 seconds or faster.  When I was ready to click, I wiped down the front of my lens with a towel that I lifted just as my shutter clicked.

Yosemite April 2019 Images

(processed so far)

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Shameless plug

I just scheduled my 2020 Yosemite Spring photo workshops, April 5-8 and May 4-7. Both are timed for the full moon to maximize our moonbow chances. And of course it’s not all about waterfalls and rainbows—this year’s spring workshops included some spectacular clearing storms, beautiful moonrises, and brilliant poppies. In addition to great photography, you’ll improve your photo skills with daily training and image reviews. You’ll also have lots of fun.


Yosemite Spring

Click an image for a closer look and to view slide show.

Yosemite Moonbow

Gary Hart Photography: Moonbow and Big Dipper, Lower Yosemite Fall, Yosemite

Moonbow and Big Dipper, Lower Yosemite Fall, Yosemite
Canon EOS 1DS Mark III
Canon 17-40 f/4L
30 seconds
F/4
ISO 800

Even though your spellcheck says it doesn’t exist, I promise you that a moonbow is a very real thing indeed (and I have the pictures to prove it). Some argue that “lunar rainbow” is more the technically correct designation, but since that moniker just doesn’t convey the visual magic, I’m sticking with moonbow.

This won’t be on the test

Because a moonbow is a rainbow, all the natural laws governing a rainbow apply. But all the moonbow’s physics can be summarized to:

1) Your shadow always points toward the center of the moonbow (put your back to the moon and note the direction your shadow points)

2) The higher the moon, the lower the moonbow and the less of it you’ll see

3) When the moon is above 42 degrees (assuming flat terrain), the moonbow disappears below the horizon

Yosemite’s moonbow

Each spring, Sierra snowmelt surges into Yosemite Creek, racing downhill and plunging 2,500 feet in three mist-churning steps as Yosemite Falls. Shortly after sunset on spring full moon nights, light from the rising moon catches the mist, which separates and bends it into a shimmering arc. John Muir called this phenomenon a “mist bow,” but it’s more commonly known today as a moonbow.

While a bright moonbow is visible to the naked eye as a shimmering silver band, it isn’t bright enough for the human eye to register color. But thanks to camera’s ability to accumulate light, the moonbow’s vivid color shines in a photograph.

I just returned from the first of two moonbow workshops scheduled for this spring, but haven’t had time to process this year’s moonbow images. The above image was captured a few years ago near the bridge at the base of Lower Yosemite Fall. Not only was it crowded (the moonbow is no longer much of a secret), wind and mist made the necessary 20- to 30-second exposures an exercise in persistence. Not only was I able to capture the moonbow, as you can see, I now have photographic proof that the Big Dipper is the true source of Yosemite Falls.

My 2019 Moonbow workshops are now open


A Moonlight Gallery

Click an image for a closer look and slide show. Refresh the window to reorder the display.

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