Migratory Birds in Twilight, Central Valley. Merced National Wildlife Refuge, California. February 8, 2012. © Copyright 2012 G Dan Mitchell – all rights reserved.

Migratory birds flly though the twillight winter sky above California’s Central Valley and the Coast Range.

I made this photograph when it was almost too dark to see clearly. In fact, when I packed up and drove away a few minutes later, it was so dark that I momentarily got mildly lost on my way out of the refuge! Long after the sun had set, and at the time when perhaps the most intense sky colors appear, the migratory birds were still in flight above the Central Valley, often silhouetted against the colorful dusk sky just above the horizon.

This photograph is going to get a bit more technical explanation than usual. I had a 100-400mm telephoto on the camera at this point since I had been photographing the birds in a variety of ways, including trying to fill the frame with one or a few birds. While some might say that shooting a prime lens of this length could have some image quality advantages, this photograph wouldn’t have happened if I had been shooting, say, a 400mm prime. Since I wanted to move quickly from targeting small sections of the surroundings or even individual birds to making photographs that attempt to portray the larger landscape within which the birds are found, I frequently found myself moving quickly to much shorter focal lengths. Here, I realized that I might be able to “zoom out” and include some of the birds in flight high above the valley and the distant mountains in the context of their surroundings. So I shot this at something like 130mm. In addition, because the scene includes subjects that are not that far away (like the trees) and those at much greater distances (like the hills), depth of field was an issue with the longer focal lengths. I couldn’t shoot wide open without some excessive focus issues, so I stopped down to f/11. Think about that for a moment: shooting in extremely low light, stopped down to try to maintain some depth of field… and needing use a shutter speed allowing me to get some definition out of birds flying through the scene. This is essentially being caught between a rock and a hard place… and another rock. With the camera on the tripod, but still aimed manually, I used a shutter speed of 1/13 second and turned image-stabilization on. With all of this stuff pushing boundaries of shutter speed and aperture… my only option was to increase the ISO to 1600. For landscape work. Here’s the thing… in the end, while there was more noise in this photograph than if ISO 100 were possible, it isn’t that bad and probably wouldn’t even be visible to viewers of a print. While I’m usually persistent in my view that little technical differences among cameras don’t amount to much, in this case it was because current cameras make it possible to shoot in ways that were essentially impossible a decade ago that I could get this photograph at all.

G Dan Mitchell is a California photographer whose subjects include the Pacific coast, redwood forests, central California oak/grasslands, the Sierra Nevada, California deserts, urban landscapes, night photography, and more.
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Text, photographs, and other media are © Copyright G Dan Mitchell (or others when indicated) and are not in the public domain and may not be used on websites, blogs, or in other media without advance permission from G Dan Mitchell.