7D setup question

I am thinking of getting a 7D but have a question. I currently have an XSi, if I set C.Fn IV to 1:AE lock/AF and then use one shot AF with evaluative metering, if I press and hold the * button then it locks AF but not metering. Is there a way I can directly replicate this on a 7D?

Yes, you can.

Thanks, care to elaborate as to how as i have downloaded the owners manual and going through a few things just now?

Page 217 - C.Fn IV Custom Controls

This is where you can set things such as backbutton auto focus control - you just assign the button layout so that the shutter is only controlling exposure and picture taking.

I read this on another thread :-

Because if you are using One Shot AF and evaluative metering, then you have an inherent exposure lock as soon as you lock focus.
But if you allow the trigger button to do metering only, then you have two options.
1.Focus with AF-ON, then hold the button while you re-compose and take the picture, with both exposure and focus locked.
2.Focus with AF-ON, then release the button, re-compose and take the picture. The camera will not re-focus (thus effectively execute One Shot AF), but will not lock exposure.
If you focus with half-press, you have no choice but to maintain both focus and AE lock at the same time.

Does this mean than holding the AF-On button down will lock AF and Exposure? This is the opposite of the XSi which allows you to hold the * button but not lock exposure. Can any one confirm?

match14 wrote in post #12142884
Thanks, care to elaborate as to how as i have downloaded the owners manual and going through a few things just now?

I don't suggest going into details with Custom Functions before you actually have camera in your hands - it'll just confuse you.
However, you can watch some videos on YouTube, just to get an idea how it all works together:

http://www.youtube.com …ch_query=7d+set​tings&aq=f

if you hold the AF-ON button, AF will start (and continue if in servo). Exposure will start, but not lock...eg. holding my AF-ON button while looking at the screen and then moving off it, the exposure still changes.

The only way for exposure to actually lock (i've found) is if you use the AE lock * button, or if you set the shutter to AE lock instead of metering start.

i have my shutter set to metering start and AF-On to metering and AF.

Ok thanks to everyone who took the time to reply.

Normally, One Shot AF combined with evaluative metering will lock both AF and AE, when you execute AF. So as long as you keep AF-ON pressed, when the half-press of the trigger button executes metering only (no AF), you also effectively keep AE locked.

There is only one case when this does not happen. That's when you explicitly assign half-press to imply exposure lock. If you do that, then pressing AF-ON will not lock exposure in this case. You have to hold the trigger at half-press to accomplish that. Or press the * button.

This is of course true for cameras with both AF-ON and *. A camera with * only, like the 1000D, will only do one of the functions at a time. Either that of AF-ON or that of *.

apersson850 wrote in post #12145250
Normally, One Shot AF combined with evaluative metering will lock both AF and AE, when you execute AF. So as long as you keep AF-ON pressed, when the half-press of the trigger button executes metering only (no AF), you also effectively keep AE locked.

There is only one case when this does not happen. That's when you explicitly assign half-press to imply exposure lock. If you do that, then pressing AF-ON will not lock exposure in this case. You have to hold the trigger at half-press to accomplish that. Or press the * button.

This is of course true for cameras with both AF-ON and *. A camera with * only, like the 1000D, will only do one of the functions at a time. Either that of AF-ON or that of *.

Aha! One shot, of course. I vaguely remembered something about it being able to lock exposure in evaluative, but I couldn't remember how to get it to work. I've had it set to servo for so long that I completely forgot about that.

Had another play with one in my local camera shop and I now have a better understanding of the custom controls now. It is a very nice piece of kit.

You are able to lock exposure in any mode, but the combination of One Shot AF and evaluative metering makes it implicit when focusing. Except when half-press is set to lock.

Yes thats what I discovered. It's really flexible in allowing different options compared to the XSi.