Posted on September 12, 2016
I rarely shoot at Mather Point because I’m usually working with workshop students struggling to corral the extreme dynamic range of a summer sunrise there. But on this morning a couple of weeks ago, about half the group had congregated at the rail in near the Mather Point amphitheater, allowing me to set up my tripod and occasionally visit my camera. When it became clear that the clouds were setting up for something special, I prepared my composition, set my f-stop to f/18 (in the sunstar zone), and ready my graduated neutral density filter in anticipation of the sun’s first rays peeking out from behind Wotan’s Throne.
Knowledge is power
As with many of my images, I can trace this image’s creation to long before the shutter clicked. That’s because, whenever possible, I avoid arriving at a location without knowing at the very least when and where the sun will appear or disappear. In this case I was familiar enough with the Mather Point in August to know that the sun would rise between Wotan’s Throne and Vishnu Temple. But I needed to be more precise than that.
We’re living in an era of ubiquitous information, carrying mini computers with the potential to make virtually everyone an instant astronomical genius. Though my own workflow for computing sun/moon arrival/departure information was established long before smartphones, it amazes me both how easy the internet and smartphones have made preparation, and how few photographers do it.
I got a little head start because I studied astronomy in college for a few semesters (long enough to learn that the essential math would would wring the marvel from my mind), enough to have good mental picture of the celestial rotations and revolutions that determine what we see overhead and when we see it.
While I’m just geeky enough to prefer plotting all this stuff manually, for most people I recommend starting with one of the excellent apps that automate most of the process. Of the two apps I recommend, PhotoPills and The Photographer’s Ephemeris, I prefer PhotoPills because it seems more complete, but they’re both excellent.
If you’ve tried either of these apps and found them too complicated, don’t be discouraged—neither is so intuitive that you should expect to simply pick it up and use it. But each is logical and well designed, and I promise that the more you use it, the easier it will become. In other words, practice!
As with most things in photography, it’s best not to be trying to learn to predict the timing and position of the sun or moon when the results matter. Rather, I suggest that you plot tonight’s sunset from the park down the street, or tomorrow’s sunrise from your backyard. Figure out where and when the sun will set or rise, be there to check your results, and then figure out why it didn’t happen exactly as expected. You’ll be surprised by how quickly your predictions improve after repeating this process a few times. Once you feel comfortable with your ability to anticipate a sun or moon rise or set from home, it’s time to take the show on the road—pick a spot you know fairly well and apply your new knowledge there.
Working it out on the fly
For me, celestial preparation from the comfort of my recliner is only half the job. It’s great when I know exactly where I’ll be and when I’ll be there, but the reality of nature photography isn’t quite so simple. On a first visit to a new location, I often end up places I never imagined I’d be—Hmmm, I wonder where that road goes…, or, Gee, I bet the view from the top of that hill would be great…—often with no connectivity.
On location with no connectivity, I need to be able to figure out the celestial details with only the resources at hand. The two iPhone apps I’ve come to rely on most are Focalware (I couldn’t live without this app) and MotionX-GPS.
Using these two apps, plus my basic understanding of astronomical dynamics, I’m able to figure out everything necessary to plan a shoot. On this morning at Mather Point, I pulled out my iPhone and opened Focalware to determine the sunrise time and azimuth. I used the MotionX-GPS Measure tool to drop a pin at my current location, then stretch a line, at the angle of the sunrise azimuth, across the canyon until it intersected the horizon. That was all I needed—seeing that this sunrise line passed just to the right of Wotan’s Throne, I was able to set up the composition I wanted.