Hi Everyone This is a question that may have been asked before. I am having a problem with a digital rebel. The AF seems to be erratic. Specifically, if I press down on the shutter release to activate the AF I get a lock. But if I let go and depress again, the lens sometimes refocuses. Im doing the test at wide-open aperture with a clear target on a tripod so theres no possibility of camera movement. I use the central sensor only. It shows up as an out of focus error in the pics. It tends to happen at the wide end of the zoom range. I tried the test at about 1 meter at full aperture using a Tokina 19-35 and a and a 20-35 L Zoom. I also tried the test with a 1v and a 1. The 1v and the 1 are rock solid. The focus point doesnt shift no matter how many times I tap the shutter. I cleaned the secondary mirror and the inner surface of the primary mirror on the DR. It has alleviated the problem but it still exists. I looked through dpreview but unfortunately those who have seen the problem and post on it get flamed by those who refuse to believe the problem exists. Was wondering if this is a known issue and if the solution is known. BTW: this is NOT a backlash issue. Thats to say its not caused by slight looseness in the helicoid of an AF lens, which can cause the focusing ring to register a slightly different distance depending on whether the AF locks in coming or going. This does not show up in photographs. Anyways any advice besides the copout send it in to Canon is greatly appreciated. Id like to get to the bottom of this annoyance! Thanks Javier
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