Back focus or motion blur.

Started Dec 25, 2013 | Discussions thread
brianric Veteran Member • Posts: 8,055
Re: Back focus or motion blur.

Full Frame wrote:

brianric wrote:

Full Frame wrote:

j_photo wrote:

My guess is the camera focused on the wall, prior to the boy running in front of the indicated focus point. But there was insufficient time for refocus before the shot was taken.

If it's back focus, it looks like a pretty extreme case.

Thanks for all your input

With my D90 always used AF continuous mode at 4.5 fps for sports. Gunning it I knew I was going to get a few shots in focus. But in this situation was sitting 1 foot away from basket. The boy was running toward me. I thought that at that distance would have no problem as the subject should be large enough to acquire focus and was only about 8 feet away. When I shot an air show had no problems using single point as i had a large subject matter. Guess its a learning experience with the D800.

Don't understand why viewnx showed the focus spot that i used, yet the camera used a different point. It would appear that the camera knew that i was panning and switched to predictive/dynamic mode.

What mode were you in? The D800 doesn't switch to dynamic mode by itself. I have a feeling you were in AF-S mode.

Yes it was in AF-S mode.

That's your answer. Put it in AF-C, either 9 point or 21 point dynamic focus. Adjust A3, Focus tracking with lock on as required. Same goes for A1, AF-C priority selection. I have A1 on my D800s and D3S to Release + Focus. The Df only has Release and Focus, not Release + Focus, which is another hit against the camera. I can't offer advice on A1 for the Df because I haven't used it yet at a basketball game. First game for me is January 8.

Opps, you're using D800, set A1 for Release + Focus.

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