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#1
July 15th 08, 11:18 PM
posted to rec.photo.digital
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DSLR lenses not good wide open at wide angle?
The (expensive) Carl Zeiss 16-80 for the Sony Alpha DSLRs is only good
from F5.6 onwards. With wider apertures at wide angle the corners become soft to very soft, depending on aperture and distance from the image centre. According to photozone the same holds for several other DLSR zooms (the Sigma 17-70 being an example). However the lens of the Sony R1 is good wide open at F2.8, even in the corners. Could this be because in the R1 the lens is very close to the sensor (just 2mm distance vs. 2cm in an APS-C DSLR)? Also the Zuiko 14-54 is good wide open, which could be a consequence of the 4/3 design. -- Alfred Molon ------------------------------ Olympus 50X0, 8080, E3X0, E4X0, E5X0 and E3 forum at http://tech.groups.yahoo.com/group/MyOlympus/ http://myolympus.org/ photo sharing site 
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