Note to readers: I’m keeping this post alive for its useful comment threads, but the post’s content has really been superseded by material in a newer post.
I recently received an Olympus E-M1 Mark II — the idea being that it’ll shortly replace my trusty original E-M1 I purchased a few years back. While I’ve still got both, I’ll be shooting and posting some comparison shots between the two models — but first will be writing a few posts on upgrades and changes in the new model.
First up — setting up back button focusing.
What is back button focusing?
For those unfamiliar with the term, back button focusing refers to separating the focus and expose functions that normally occur sequentially when you depress the camera’s shutter button (focus on half-press, exposure on full-press). If you “move” the focus function off the shutter button, and assign it elsewhere, life is easier when photographing a fast-moving subject (like wildlife) — you can focus once, then concentrate on your timing / composition / exposure. Assuming, of course, that your subject doesn’t change its distance from you significantly as it flits about.
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