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Pastimes : Digital Photography

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To: Ausdauer who wrote (7578)	4/25/2004 12:57:39 PM
From: Done, gone.	Read Replies (1) of 21646

I don't see how the lens itself could be at fault. For clarity purposes, here are the entire quotes from DP on this focus issue, regarding the Canon D300 as well as the Nikon D70: Overall [Canon D300] results were as expected, while there is a little variation in the position of DOF (slightly in front or slightly behind) the actual target was always sharp (apart from our 28 - 70 mm F2.8 L which appears to have a problem at 70 mm). dpreview.com The [Nikon D70] results were interesting but not unsurprising, I had noticed the 18-70 mm back focus while taking some test shots and had switched to manual focus for some of them. The 50 mm back focus was more surprising although generally I use this lens at small apertures (F9 or smaller) so this amount of back focus would be soaked up by the depth of field. As I would also expect the 28-70 mm F2.8 performed the best, clearly showing that this isn't a necessarily camera problem. dpreview.com So lenses could be at fault, somehow, across brands. Not clear to me if the problems are the result of bad designs of particular lenses, or if the tests just point out singular bad lenses of particular designs.

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