40D Focus Issues!!

Started Sep 9, 2007 | Discussions thread
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40D Focus Issues!!
Sep 9, 2007

My 40D's AF system seems to be acting a little erratically. I was using my 70-200 f/4L IS lens at f/4 and 200mm. Here is a screen shot of three successive photos taken in 6.5 fps burst mode and Ai Servo AF of a stationary object. Notice how the DoF moves from FF in the 1st shot to BF in the 2nd and FF again in the 3rd. Looks screwy to me.

The 40D and 70-200 was doing this quite often thru-out the entire game. Took 298 pics in this flag football game, 72% were in-focus, 11% were BF and 17% were FF. Many of the shots were of stationary players at the line of scrimmage prior to the hiking of the ball, took these kind of shots just to test out the new camera's AF accuracy. It also occured while tracking a moving player.

Any feedback to any reasons that could be causing this?

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Bryan P.

OneDMarkTwoN, FortyD, ThirtyD, ASixThirty, ASixForty, ASevenTenIS

The best thing that could poke you in the eye....is your viewfinder.

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