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Nikon DSLR Cameras
D5100
Setting up Back button focus
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<blockquote data-quote="nickt" data-source="post: 405753" data-attributes="member: 4923"><p>I don't recall hearing that you can't do bbf on the d5100. I know on my d3100, there is no way to set release priority so I think that defeats most of the purpose of the technique on that camera. You need release priority so you can shoot in af-c mode, but still get a pseudo af-s mode by releasing the back button. This would be used for focus and recomposing. Push bb to focus, release bb, recompose, shoot. This won't work on the d3100 because there is no release priority, the camera must see focus to fire. After recomposing, the focus point could fall on blur and the camera won't fire.</p><p></p><p>I just looked in the d5100 manual. It looks like you only have af-s, af-f, and MF in Live View. I'm thinking you don't need af-c in that case. If you are in af-s, you push the back button and it should focus, release the button and it stays put. I think you will also be able to take the shot if you recompose even though the focus point may then fall on blur. Af-f focuses full time, so no need to hit back button at all. This is what I am seeing on my d7100. I'm not a live view guy though except for some video and some manual focusing for macro. </p><p></p><p>As for auto mode, you really won't be spending a lot of time there. It will still focus with the back button if you find yourself in auto. It might even let you focus and recompose. You won't be able to hold the button down and get continuous focus, but you wouldn't get that with the shutter button either.</p></blockquote><p></p>
[QUOTE="nickt, post: 405753, member: 4923"] I don't recall hearing that you can't do bbf on the d5100. I know on my d3100, there is no way to set release priority so I think that defeats most of the purpose of the technique on that camera. You need release priority so you can shoot in af-c mode, but still get a pseudo af-s mode by releasing the back button. This would be used for focus and recomposing. Push bb to focus, release bb, recompose, shoot. This won't work on the d3100 because there is no release priority, the camera must see focus to fire. After recomposing, the focus point could fall on blur and the camera won't fire. I just looked in the d5100 manual. It looks like you only have af-s, af-f, and MF in Live View. I'm thinking you don't need af-c in that case. If you are in af-s, you push the back button and it should focus, release the button and it stays put. I think you will also be able to take the shot if you recompose even though the focus point may then fall on blur. Af-f focuses full time, so no need to hit back button at all. This is what I am seeing on my d7100. I'm not a live view guy though except for some video and some manual focusing for macro. As for auto mode, you really won't be spending a lot of time there. It will still focus with the back button if you find yourself in auto. It might even let you focus and recompose. You won't be able to hold the button down and get continuous focus, but you wouldn't get that with the shutter button either. [/QUOTE]
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Nikon DSLR Cameras
D5100
Setting up Back button focus
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