I also think these problems may be due more to focusing errors than anything else. In all the tests I've seen, the Zeiss lenses are focused manually of course. But I don't know about the EF lenses. If they are being AFed for the test then the test is invalid. All the MFGs accept that AF is not quite as much on the money as MFing the same lens. But Canon seems to have some big problems in this regard. My EOS digital rebel can't focus any of my lenses properly. The 1Ds I just got can't either. The thing I've noticed that bugs meore than everything else, is that the same camera and lens on a tripod pointed at the same target will give different readings if you actuate the AF via the shutter release several times. Initially I thought it was a settling down sort of problem and after tapping the release a few times the lens had homed in. But later I noticed that the first tap is sometimes the best one. Naturally, the thing has me going nuts. Originally I had felt the 1Ds would be a solution to my "cheap EOS AF problems" but no. I searched for AF issues on dpreview and they acknowledge that there is some sort of inconsistency but I couldn't find out if it was an actual problem or just the nature of the technology. Anyway, I've had to settle for shooting at less than full aperturre which kinda sucks if you paid more for a fast zoom. The problem seems to be worse close up and at wider angles. All I can say is that if this is not a problem byut rather simply the way things are, then EOSes are useless as AF cameras! For some reason though. I don't remember having any of these issues with any of my earlier EOSes: 6x0 1 1n or rebel X. Any ideas or info on this would be real helpful. Javier
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