Once the AE-AL button is set to AF-On for back button focusing on a D7100, what changes if any are people making to C1 shutter release button AE-L? As I understand it, with C1 left to Off, exposure will continue to be monitored and reset as long as the shutter button is half-pressed, but with C1 on, exposure will be set and locked with a half-press. I'm thinking of leaving C1 to off, but customizing either
Fn or Preview button to AE-lock. That way I have my back button focus working, can set exposure continuously with a half press of the shutter button as I meter different parts of my scene and lock it (by pointing, say, at blue sky to avoid under exposure when I'm shooting snow) with a press of Fn or Pr. Does this make sense?
#1. "RE: BBF Exposure Controls?" | In response to Reply # 0JosephK Nikonian since 17th Apr 2006Fri 07-Feb-14 06:17 PM
Sounds like you have a good handle on what is going on. This is one of the few things I don't like about the D90/D7000 line where there is not separate buttons for af-on and ae-l.
My D70S does not have a programmable function button, so you have an advantage there. The config I used was the button set to af-on and the shutter button locked the exposure most of the time. Sometimes I reset it to let the exposure float.
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#2. "RE: BBF Exposure Controls?" | In response to Reply # 0jbloom Nikonian since 15th Jul 2004Sat 08-Feb-14 10:40 AM
Whether C1 is on or off, if you aren't holding down on the shutter button or the AE-L button the camera continuously meters as you move the camera around. (Until the standby timer has expired, but that's easy to reset.) So there is really no need to half-press the shutter button while you do that.
In short, with C1 on you can:
Use AF-ON to focus
while pushing no buttons, meter the scene as you like,
once you have the metering you want, half-press and hold the shutter
reframe and shoot.
If you want an AE-Lock with hold, then it makes sense to assign the Fn button. Without hold, you're just duplicating with the Fn button what the half-press of the shutter can do with C1 on.
Not that there is a "wrong" way to set it up. I have C1 On for routine shooting but turn it off for sports action in varying light because I want the metering to adjust as I track the subject.
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