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04-04-2009, 07:46 PM   #1
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Is my k20d back-focusing?

Or is the lens sharper away from the middle? I had focused on the back of the taller veteran, in the middle of the circle around BVV, using CF focus mode. All the letters on the back his jacket look a tad OOF and blurry, even at 50% magnification. The shorter veteran, to his left, was standing <1ft ahead of him. Yet, the lettering on the back of his jacket appears to be on the real plain of focus, sharp all the way to 100% magnification.


Last edited by wasim_altaf; 07-13-2009 at 09:38 AM.
04-05-2009, 05:05 AM   #2
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QuoteOriginally posted by wasim_altaf Quote
Or is the lens sharper away from the middle? I had focused on the back of the taller veteran, in the middle of the circle around BVV, using CF focus mode. All the letters on the back his jacket look a tad OOF and blurry, even at 50% magnification. The shorter veteran, to his left, was standing <1ft ahead of him. Yet, the lettering on the back of his jacket appears to be on the real plain of focus, sharp all the way to 100% magnification.
Did you select a focus point, or use the centre point and reframe? The reason I ask is that in AF.C mode the camera might have been refocussing on the distance as the shot was taken. If you had been using AF.S and reframed, the man on the left would probably be closer to the original focus than the man on the right.

Gerry
04-05-2009, 07:08 AM   #3
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QuoteOriginally posted by Lazaruscomeout Quote
Did you select a focus point, or use the centre point and reframe? The reason I ask is that in AF.C mode the camera might have been refocussing on the distance as the shot was taken. If you had been using AF.S and reframed, the man on the left would probably be closer to the original focus than the man on the right.

Gerry
Hi Gerry,

I used AF.S, selected center focus point only and focused directly on the back of the man on the right (I only posted a section of the pic, due to size limiteation). There was no reframing. I think have other examples of such BF issue under identical camera settings.

Wasim
04-05-2009, 08:10 AM   #4
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So in the original picture, the taller guy is dead center?

If so, it does seems the camera misfocused, but one picture isn't enough to say for sure what happened exactly. If you want to understand better, download a good focus chart, carefully read the instructions on how to use it, and do some controlled testing.

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