Re: 15/3.5 sharpness?

[Alan Chan]

Could be, but I have no way to tell. Axis alignment is virtually fixed and 
determined by the accuracy of the machining, as with most Pentax manual 
focus primes. The glass to glass distances may be altered when they were 
being reassembled. But then again, there is only one way to screw them in 
(till stop). If they are manufactured accurately, they should be again when 
reassembled. Perhaps they have some instruments to measure individual glass 
to glass distance in the factory, that I do not know (if possible at all)? 
Anyone know anything about this?

Alan Chan
http://www.pbase.com/wlachan
No, they don't. They look like the pictures I took with my A15/3.5 on the
*ist D. Pictures I took on film (usually shot on color slides such as the
Sensia 100) with the same lens were far better. On film, all apertures 
f/5.6
to f/11 are more than useable, while I tried to avoid shooting at f/3.5,
f/4, f/16 and f/22 because of noticeably lesser sharpness.
I don't know which is the weak ring in your chain, but the 15/3.5 can
deliver  better sharpness for sure. I've been told the 15mm (all 15mm
lenses, not the Pentax) to be very critical about alignment of optical
elements. Can this be the possible reason for its poor performance?

Dario Bonazza
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