The Sony NEX-5R has an "AEL w/ shutter" option that
Sets whether or not to fix the exposure when you press the shutter button halfway down (On/Off)
(from the manual)
What are the pros and cons to locking the exposure? Under what situations does it help, or not help?
I can think of specific examples where locking exposure helps, and examples where it hurts, but I wanted to check if there's a bigger picture I'm missing.
As I understand, this setting controls only the exposure and not the focus, which is controlled by setting the focus mode to AF-S or AF-C.
Note that this camera doesn't have an AEL or AE/AF lock button.