----- Original Message ----- From: "Alan Chan" Subject: 15/3.5 sharpness?
> Just had my first roll of 15/3.5 pictures back. The first thing I have > noticed is, they aren't very sharp (maybe I should redo the test on cloudy > day). Okay, I knew the Pentax one is the least sharp of all 15mm (Zeiss, > Leica, Nikkor), but do these picture look okay (I reckon the actual films > are sharper than scans)? They were taken with Konica Centuria Super 100, and > scanned by Minolta Scan Elite F-2900 (2820dpi). > > http://www.pbase.com/wlachan/pentax_1535 > > Also, this short test shows f11 seems to be the optimal aperture. f3.5 is > pretty bad on sharpness, f5.6 is okay, but certainly not good. Manual > focusing is next to impossible without the magnifier because everything > appears so small (right everybody has been saying that everything will be in > focus virtually, but it doesn't seem to be the case to me). Super wide angle lenses aren't as sharp as lenses where the rear nodal point is closer to or still within the lens. It's one of the compromises we have to put up with to get reflex mirrors. William Robb
