Day 2 Portraits Field exercises
For shots with real impact, you need control of what’s blurred and what’s sharp. It’s all about the depth of field…
on’t ever forget this! A lens can only ever focus precisely on one distance at a time, and so whatsoever you do only one point (or plane) is perfectly sharp. In practice, thankfully, more of your picture looks sharp because of a an optical principle known as depth of field.
Controlling depth of field is one of the key skills that any sharpshooter needs to master, because it enables you to decide which bits are in focus. Just as importantly, you need to learn to use depth of field to control what is blurred. Optical blur is what distinguishes SLR photography from shooting with a compact camera or cellphone, as it gives you the power to defocus whole zones of your image.
The key control for depth of field is aperture, which you can easily alter in A, S, P or M exposure modes. But you need to learn that aperture alone is not enough. Use your camera position and the focal length of your lens to become a master of this essential fieldcraft.