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Old Dec 26, 2007, 10:21 PM   #11
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JohnG wrote:
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Both shots are back focused. The defender behind him is in better (but not sharp) focus.
JohnG I have the same problem with the back focus. What is the best way to correct this. I use center focus on my Canon 20D.

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stoltzy
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Old Dec 26, 2007, 10:51 PM   #12
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stoltzy wrote:
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JohnG I have the same problem with the back focus. What is the best way to correct this. I use center focus on my Canon 20D.

Thanks

stoltzy
The answer is: it depends.

You need to determine if it's an equipment problem or a technique problem. Does the 50mm backfocus for other puroposes? Or just basketball? Does the camera backfocus with other lenses (be careful here - the more DOF you have the harder it is to detect front/back focus issues). Do some tests on stationary subjects and figure out if it's equipment.

If it isn't the equipment then it's technique. Typical reasons are:

1. Not tracking a high contrast area

2. not using AI-servo

3. Not keeping focus point on your subject

4. Not tracking long enough before firing shutter (on 20d that's about a second in low light)

5. Change of direction in your subject's movement
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