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Forum: Pentax K-5 & K-5 II 12-20-2011, 01:18 PM  
K-5 AF questions...
Posted By polachekphotography
Replies: 16
Views: 2,393
I haven't photographed a stage producton before, but I generally use the centre focus point because I like to lock focus and recompose. I find that using the centre point allows me to better predict how the AF will behave. Your preferences may vary, of course, and as others have suggested manual focus may provide better results in poor light.

As for "back-button focusing", as it's known, I only first heard about it this year, at a wedding photography workshop. The instructor was a Canon shooter and raved about it, so I decided to try it out. I believe you press the AF button until focus is achieved, then release it and take the photo.

However, I haven't confirmed this but I really suspect the Canon and Nikon half shutter depress function works differently than it does on the K-5/K-7. With a half shutter depress, my K-7 will acquire focus and lock, and won't attempt to refocus unless I release the shutter button and do another half depress (hence why I can lock focus and recompose). So I honestly haven't encountered the issue that back-button focusing presumably solves (i.e. if the shutter button is depressed halfway the camera will attempt to refocus if someone or something passes between you and your subject). I'm curious to hear what others have to say on the subject though.
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