. Some of you may have seen from a couple of forums posts that I ran into a problem using the 10D with my 70-200 LIS. During a series of about 90 shots of the foxes in my garden, the camera locked up 4/5 times. Power off didn't clear the lock-up, but popping the battery retainers and reinserting in the BG did. I thought the display read "Err 00". However, when I checked the manual — expecting it to be "lens communication error" — I found there's no such animal: only 1, 2, 4, 5 and the catch-all 99. I rang the UK Canon Help Desk (08705-143723, if anyone wants the number). Robert — very nice and helpful — confirmed that Err 00 doesn't exist, and suggested it might just have been 00 in the aperture setting without "Err". 00 means no lens, but should only appear in Av mode and I was shooting in Tv. 
Ultimately, Robert could not fully diagnose the problem, but suggested it was lens rather than camera. Several responses to my forum posts and my pro friend, Craig, point to a potential IS fault, which is 
and sounds like it might be expensive - the lens, Sod's Law being what it is, is 13 months old. Anyway, more in hope than expectation, I've cleaned the contacts on the lens, so that, if the problem does re-occur, I can document it properly before sending it for service.
To finish today's entry on a positive note, the aforementioned Craig took systematic sets of test shots — 144 in all — with different lenses, two apertures, raw and JPG to check the "reset effect". He found no before and after difference, but I thought you'd be interested in his assessment:
Seven-point AF is a little inconsistent in choice, choosing different sensors from frame to frame, despite the subject remaining unchanged. MF was better on average. The camera is not consistently, deadly accurate using the central AF sensor but is, on average, more accurate than my eyesight! It seems the AF module is not as finely tuned as the higher end cameras.
Conclusion: 10D AF is faster and more accurate than D60, especially, at low light levels (without AF assist). As you said, "camera works as expected".
Craig also added:
At normal sharpening, 10D appears not as sharpened as D60 images. Can't be absolutely certain on this one without a side by side comparison.
Setting degrees Kelvin from my Minolta Colormeter produced perfect neutral grey, without modification at 4300 degrees flash f/16, 4100 degrees flash f/4, 2800 degrees tungsten 1/3sec f/4 all at ISO100.
And ended his e-mail to me with the gung ho:
That's it I'm done lab testing, all further tests done live and by the seat of my pants.