Thanks to those who offered suggestions. I found my screwmount to K
converter in a box of Canon FD
lenses. (What was I thinking.....?)
I wanted to try a favorite Spotmatic lens on my K10D. It's a Carl Zeiss Jena
25mm 1:4 Flektogon. A mighty glass using 77mm filter. I got it at a flea
market in Rome in 1991. It was almost welded to my Spotmatic for years. The
Pentax SM converter installs and uninstalls(a concern with these things)
without problem on the K10D but the Flektogon has play when mounted. About
a quarter inch of rotation loose. I had problems holding everything together
during exposures and images were unsharp. I found a way to eliminate the
play but images were still unsharp. Eventually, I discovered the focus was
off a bit when using the scale to focus.(TTL focus is quite difficult with
the K10D screen and the F4 ap on such a wide angle) Focus confirmation to
the rescue! I never neded it
before.
The Zeiss 25mm is at least as sharp all across the frame as my "best" SMC-M
28/3.5 wide angle.
Just for fun I compared the 25mm and 28mm to the 18-55 kit lens. To my utter
surprise the kit lens at 24 and 28
on the same test target (a shingled old building nest door) was almost as
good as the prime lenses. All tested at f8, BTW and viewed at 1:1 in LR2. At
moderate magnifications there is no practical difference. Well, it was fun,
anyway.....
Bill Lawlor
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