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Focus on D7200

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Old Thursday 17th October 2019, 19:31   #1
gerald762
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Focus on D7200

I have been recently trying back button focus on this camera. However the images don't come out quite as sharp as when I use the shutter button to focus and shoot. Any suggestions as to why this might be?
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Old Thursday 17th October 2019, 22:42   #2
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Not a Nikon user, but do you introduce more shake this way than previously? A way to test would be to set shutter speeds very high for some test shots. If the problem disappears then you might need to think about how to change your handling

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Old Thursday 17th October 2019, 23:02   #3
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Are you using AF-S or AF-C? I don't think AF-S would be a great mode as there is a delay between focus and shutter release.

Personally, handheld, it is too many buttons to press at one time for me, especially with a big lens. On a tripod, no problem. I mostly use BBF to focus trap on a spot to catch bird (i.e. hummingbirds) when they fly into land or take off.

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Old Thursday 17th October 2019, 23:57   #4
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I use BBF with AF-C & AF-S without issue. HAve a look at Steve Perry's videos and see if you can determine what you're doing wrong.
https://www.youtube.com/watch?v=FzqQskGoURE&t=238s
https://www.youtube.com/watch?v=_N_bzhJAKms
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Old Friday 18th October 2019, 05:47   #5
nikonmike
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Unless it's changed from me having the D7200 BBF overrides focus priority so you can take pictures that are not in focus.
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Old Friday 18th October 2019, 17:16   #6
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Thanks for the replies I am definitely on AF-C, with a shutter speed of 1/1600 th. I was also using a tripod. I will check out the video links soon.
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Old Saturday 19th October 2019, 06:12   #7
marcsantacurz
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Quote:
Originally Posted by nikonmike View Post
Unless it's changed from me having the D7200 BBF overrides focus priority so you can take pictures that are not in focus.
I'm not sure on the d7200. On the d500, d850 you can select focus priorty independently of BBF. If you set focus priority + BBF, you can focus trap. That means you can focus on a spot, fully press the shutter release and if there's nothing in focus it will not release. Then when a critter (i.e. hummingbird) flies into the focus spot it will release (or multiple release if you have CL or CH selected). I usually use 9-point or 15-point AF areas, as those allow me to pic a spot that is out of focus compared to the perch and still get a bit of area AF going.

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Old Saturday 19th October 2019, 08:48   #8
Apodidae49
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I’ve messed around with BBF on the D7200 and decided I didn’t much like it. However I watched a tutorial on how to set it up and I made sure I disabled AF on the shutter release, if that has any relevance?
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Old Saturday 19th October 2019, 10:03   #9
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Quote:
Originally Posted by Apodidae49 View Post
Ive messed around with BBF on the D7200 and decided I didnt much like it. However I watched a tutorial on how to set it up and I made sure I disabled AF on the shutter release, if that has any relevance?
Sounds like the most likely explanation. The setting should be AF-On only, otherwise the camera focuses (again) when you press the shutter button.

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Old Saturday 19th October 2019, 18:14   #10
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I have checked the settings and everything seems correct! I will have to run more tests.
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Old Sunday 20th October 2019, 01:20   #11
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On some Nikons the default for AF-C is release priority, so it will start shooting as soon as you press the shutter even if not focused. It should converge to focus as you press the BBF button.

Personally, I use focus priority, not release priority, for AF-C.

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