have you tried this lens with a bellows instead
of tubes? I have used the bellows takumar and
many other bellows lenses from 80mm to 150mm on digital with zero
problems whatsoever. The tubes may be causing those reflections...
jco

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of
Bob Rapp
Sent: Saturday, April 28, 2007 1:52 AM
To: Pentax-Discuss Mail List
Subject: M42 adaptor and the K10D


    I have been testing some of my lenses on the K10D and got around to 
testing the 100 mm f4 bellows with extension tubes and helicoid. 
Unfortunately the bellows Takumar is not compatible with the digital
sensor 
as there is centre is over exposed due to lens reflections:-(
    One thing I did notice was how easily the Pentax M42 installed into
the 
K10D body. Since there is no aperatue simulator, it is much easier to 
install - Thank you Mr Pentax! :-)

Bob 

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