On Nov 10, 2005, at 6:23 AM, Javier Perez wrote:
I’m doing the test at wide-open aperture
with a clear target on a tripod
Does your target have regularly spaced lines or some other kind of
fixed pattern? It's possible for the "rangefinder" part of the AF
system to lock onto different repeats of a pattern, and have major
focus errors as a result.
With a brick wall this can be possible also - as you have used a camera
with a coincident image rangefinder, you can imagine how it's possible
to align the next brick over with the main image in the rangefinder
spot.
Just a thought...
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