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Pastimes : Digital Photography -- Ignore unavailable to you. Want to Upgrade?

To: Done, gone. who wrote (7577)	4/25/2004 10:09:16 AM
From: Ausdauer	Read Replies (2) \| Respond to of 21646

Michal, for what it is worth, I have had no focusing issues with my camera. Aren't all photos initially out of focus? I question exactly what is meant with "calibration" as it relates to auto-focusing. One of my patients is a retired Honeywell engineer who was around when the original patents for autofocusing were developed. He explained that with film cameras a separate CCD element is dedicated to the auto-focus function. The camera then "dithers" by making small incremental changes in the focal length until the greatest separation of individual "pixels" is achieved. This means there has to be some contrast or granularity in the subject for the focus to work. If for some reason your lens should become "uncalibrated" I would assume the autofocus could still compensate for this unless the CCD for auto-focusing and the CCD for image creation are dissociated or maladjusted. I don't see how the lens itself could be at fault. Aus