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Quick question about rear AF button

Nikon32250

St. Augustine, US
4033 posts

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Nikon32250 Silver Member Nikonian since 16th Mar 2004
Sun 30-Mar-14 04:33 PM

I find myself increasingly using the rear AF button while having the shutter set to release only. My question is how long will the subject remain in focus once I take my finger off the button if I am using the AF-C setting? Lets say that I have focused on the subject using the rear AF button, and they then move. I know that the subject should remain in focus. However, if they are now closer or further away do I need to re-focus or will the camera continue to keep the subject in focus? I assume that after a certain amount of time one has to re-acquire focus, but I don't know how long it takes before I have to touch the rear AF button again.

Graham
From St. Augustine, FL. "I like photographers, you don't ask questions." Ronald Reagan to White House Press Photogs

http://www.ancientcityphotography.com/>

Visit my Nikonians gallery.

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