15/3.5 sharpness?

[Alan Chan]

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).

Alan Chan
http://www.pbase.com/wlachan
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