> > From: Henry Posner/B&H Photo-Video <[EMAIL PROTECTED]> > > >The January issue of Chasseur d'Images contains a test report of the DO > > >lens. > > > > > >"We were expecting more, especially wide open" (note: test graph shows that > > >this lens needs to be closed down 2 stops to reach optimal performance - > > > Well one of Germany's magazines just tested the 400mm/4.0 DO and came > to the conclusion that it does not get better with stopping down. > Does this mean that every single lens is different? > According to Chasseur D'Images (or was it Reponses Photo?) the lens assembly of diffractive optics requires a micron tolerance! If this is true, it could account for some differences between different lenses and the high price tag of the lens.
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