Most wildlife photographers shoot wide open or close to it. F/4, f/5.6, and f/6.3 cover the bulk of working aperture choices. The fast aperture buys you shutter speed in poor light and isolates the subject from a busy background. You stop down to f/8 or f/11 when you need depth of field for two animals at different distances or for environmental wildlife shots.
Why most wildlife photography happens wide open
Two reasons. The first is light. Wildlife photography happens in low-light conditions more often than people expect. Pre-dawn, post-sunset, deep forest, overcast coast. A faster aperture lets you keep the shutter speed high enough to stop the motion of an animal that doesn’t hold still. Drop from f/5.6 to f/8 and you’ve cut your light by half, which means halving your shutter speed or doubling your ISO. Neither is free.
The second is subject isolation. A busy background, willows, tall grass, dappled forest, can make an animal disappear into the frame. Shooting wide open shrinks the depth of field and softens the background, lifting the subject out of the clutter. With a long lens at f/4 or f/5.6, the eye focuses on the animal because the background isn’t competing.
When to stop down
Three situations come up often.
- Environmental wildlife shots where you want the animal sharp and the landscape sharp behind it.
- Two animals at different distances where you need both faces in focus.
- And images shot at very close range, where even a long lens has shallow depth of field at full aperture and one eye is in focus while the other isn’t. F/8 to f/11 handles all three. Beyond f/11, diffraction starts to soften the image on most sensors. But I’ll use f/16 if I need it to capture the depth of field an image needs. Diffraction is less of a problem than an out of focus eyeball or nose.
The f/2.8 versus f/4 question
This question comes up more in wildlife forums than it does in actual fieldwork. The honest answer: in most situations, f/4 is enough. F/2.8 buys you one stop of light and a slightly shallower depth of field, both of which matter sometimes but not most of the time. F/4 telephoto zooms are smaller, lighter, less expensive, and produce strong images. The 70-200 f/2.8 makes sense for indoor sports and event work. For most wildlife, the f/4 zoom is plenty.
The f/5.6 and f/6.3 zoom reality
Most affordable long zooms are f/5.6 or f/6.3 at the long end. People treat this as a problem. It usually isn’t. Modern sensors handle high ISO well enough that the slight loss of light at f/6.3 versus f/4 rarely shows in the final image. Don’t pass on a 100-400mm or 200-600mm zoom because the maximum aperture isn’t f/4. You’ll get more frames from a lens you can carry than from a faster lens you leave at home.
