Originally posted by Maynerd I can't believe so many of you want the AF button to control something else. I personally disable the auto focus on the shutter and use the AF button exclusively, simply for the purpose of focusing and re-composing without having to hold the shutter halfway down for an extened period of time. I use this both in the studio (when I have fine-tuned my focus) and in everyday shooting.
For the same reason as you have, I am currently experimenting with decoupling AF from the shutter. I don't need this mode always, so I miss the halfway shutter AF half the time.
What I'd like to see is an AE-L equivalent for auto focus. Here is one approach:
While shutter button is depressed halfway, pressing the AF button engages AF-L. Auto focus is disabled until:
1) A picture is taken
2) AF button is pressed again
3) Dial Mode change
4) Power Off
Similar to AE-L, unpressing the shutter button does not disengage AF-L mode.
The LCD, view finder indication for AE-L should be extended to indicate AF-L.
I don't have a K-7, so naturally, I want this on K-20 :-)