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12-23-2012, 09:46 AM   #1
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Focus on Sigma 70-200 F2.8 HSM II

Have a Sigma 70-200 F2.8 HSM II. The picture below was taken with this lens on my K-5 body. Why is the center pretty much in focus (Player #2 in black) and the player in white to the left. But, the player just to right, about to make tackle, is not in focus. Maybe it's because he is moving towards the camera. I have noticed this in other pictures where the people are standing still. This lens is new to me and maybe I am missing something, but seems to me it should be the same as others. Can understand players on the outer edges not being in focus. Any recommendations for taking better action pictures, please fire away.

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12-23-2012, 09:59 AM   #2
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What shutter speed were you using? This looks more like motion blur to me.

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12-23-2012, 10:04 AM   #3
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1/750 sec, F2.8, ISO-1600...Focal length 200mm.
12-23-2012, 10:16 AM   #4
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That does look like motion blur, but at 1/750 I guess that's ruled out. Soft copy or focus issues? Any other samples to post at f/2.8 on a non-moving subject? Were you using AF-S or AF-C and center-point, 5, or 11?

12-23-2012, 10:18 AM   #5
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It looks to me you were panning to keep up with the guy with the ball and therefore he and the players also running to keep up are sharp, but the others are not, and the background even less so. The player about to tackle is running in the opposite direction. Strange that it occurred at 1/750, perhaps the SR wasn't quite ready?
12-23-2012, 10:35 AM   #6
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This previous picture was set on AF-C, and 5 point on the auto-focus. Below is a more stationary picture with the following data: 200mm, F3.5, 1/1000th, ISO-3200, Center Weighted Metering, AF-C, 5 point auto-focus. BTW, neither of these were processed other than down sizing for the post. The weird part to me on the second picture is #19 in the center looks a little fuzzy, but #2 to the left and #34 in the back seem more in focus.
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12-23-2012, 10:41 AM   #7
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Don't know if it makes a difference, but had the camera set up as follows: Shutter Priority, set at 1/1250 (If I remember correctly), ISO on auto with a range of 80-3200, using center weighted metering, and 5 point auto-focus. These were taken inside Cowboy Stadium with the top closed. Sure there is a better way to set up the camera, let me know.
12-23-2012, 02:38 PM   #8
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Something is not right (duh...I know you know that!) so I hope someone else can chime in!

12-23-2012, 03:37 PM   #9
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Were you using a tripod or monopod? I have this lens and find it quite heavy. Also what was the distance to the subject as this will have a bearing on the Depth of Field? I intend using my lens for similar purposes in our Australian Rules football season and would be very interested in any suggestions.
12-23-2012, 05:20 PM   #10
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Was SR on? You might as well disable it as fast shutter speeds. The motion blur could have been caused by that.

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12-23-2012, 05:33 PM   #11
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Back Focus at the 200mm end. I go +5 on my version 1 of the same lens when working at that end of the lens
12-23-2012, 06:51 PM   #12
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One thing I note is you were shooting wide open, and in the first shot thelayer on the right is further away, xoutside the depth of field
12-24-2012, 08:40 AM   #13
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Thanks for all the responses. Adam, the SR was on. Will try it with it turned off. Bdparker, will try the lens adjustment for back focus and see what happens. Was not using a tripod or monpod. Pictures were from the stands and very crowded plus everyone standing most of the game. Would love to have a sideline pass. Maybe one of these days. Interesting some of the contortions I was in trying to get a shot at times. Bad part...this was the State Championship game, so no more games for a while. Have to find something else to try these adjustments out on. Hope everyone has a MERRY CHRISTMAS!!!
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