At 02:27 PM 1/21/2006, Winsor Crosby wrote:
>How they do it is not as important as the question
>of how acccurately minimum performance is represented. It could be
>more accurate prediction than picking a lens off of the line, or
>cherry picking, and actually measuring it.
Photodo <http://www.photodo.com/prod/lens/alllensesmtf.shtml>
publishes MTF charts showing the results of actual tests and there
are, at least with a couple of lenses, significant differences
between their data and Canon's. I don't think that they cherry
picked samples for their tests so the differences might well be due
to sample to sample variations.
Later,
Johnny
__________________________
Johnny Johnson
Cleveland, GA
mailto:jjohnso4@xxxxxxxxxx
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