Started Jan 25, 2013 | Discussions thread
chlamchowder Senior Member • Posts: 2,083
AF-ON button behavior

you want to set it for release priority if you do a lot of recompose. I thought everyone did it this way.

Actually, it doesn't matter on the D4 and D800. You are correct that you SHOULD have to set it to release priority. In the new cameras when using AF-C with the AF-ON button the shutter will fire immediately, regardless of your priority setting. Nikon refuses to admit this is a bug in their current cameras and that it is working as designed.

What actually happens (on the D600, and I assume on the D4/800), is that the camera is in the selected priority mode while AF is activated. If the AF-ON button is not held down and the shutter release isn't set to activate autofocus, it goes to release priority.

I don't think it's a bug - it's definitely an intentional design change that prevents someone from not being able to release the shutter without engaging AF. With that change, there's better separation between autofocus and the shutter release when the user sets the camera to not AF with a shutter button half press. However, it does remove trap focus (I've never used it. The Nikon D600 is my first Nikon DSLR, so I don't know what I'm missing from previous generations).

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Sony Alpha DSLR-A580 Nikon D600 Sony DT 18-55mm F3.5-5.6 SAM +8 more
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