One of my Takumars does this in one of my MX's, (seems that the stopdown
pin and the mirror box wall are at just the right tolerances.

At 01:35 PM 2/10/2002 +0100, you wrote:
>Hi,
>    I need to use my M42 lenses (Carl Zeiss Jena 20/2.8 and 80/1.8) on
>    my new camera (LX). I don't have any Takumars, so I don't know if
>    Pentax copied the aperture pin length well or if they did it
>    shorter (M42 was invented not by Pentax, of course, but by
>    CZJ/CZO).
>
>    The problem is, when I mounted the 20/2.8 via the Adapter K, its
>    aperture actuation pin gently scraped against the mirror assy wall
>    on the LX (the lower protruding block), leaving slight mark on the
>    matte paint (circular, as the screwing is circular motion). I don't
>    want this :( So far it seems the paint was undamaged, I was able to
>    clean it - so it must have been just the aluminium of the lens's
>    pin leaving mark on the sturdier metal of the box).
>
>    Is it the same with Takumars? Any solution?
>
>    BTW,
>        I managed to lower the resale value of my 2 day old LX
>        considerably ;) The (bought used) LX still had the original 
> plastic foil
>        protecting the bottom panel (!). I was screwing a QR plate on
>        it, and when mounted on tripod, the camera moved on the QR (I
>        didn't screwed tight enough), tearing the plastic foil in
>        several places ;0 I will have to make a DIY "original" foil to
>        protect the bottom again.
>
>Good light,
>  Frantisek Vlcek
>-
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