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[rafadavidc]

 i inherited a spotmatic and an sp2 from my dad, along with a few lenses.
 
the spotmatic works great, actually, and it's a lot of fun to use.  however, there are problems with the sp2.
 
the mirror locks in the up position, even whe

[rafadavidc]

 by the way, i'm looking to offload this old m42 gear.  if you would like to acquire it, please let me know.
 
--RC

[Ed]

 look at tyhe center-bottom of camera and you will see a gear with a stud that hits a lever that unlocks the mirror.  Curtain tension may be weak so that the stud does not hit the lever with sufficient force.

[rafadavidc]

 as per the standard law of troubleshooting, i cannot reproduce the problem to observe what you have described.  however, i'll keep working at it and post back if i see it happen again.
 
if indeed what you have described is the problem, how

[rafadavidc]

 i have been able to establish a pattern.
 
it seems to happen most between 1/15 and 1/125.  (these speeds also seem to have incorporated a squeaking sound.  is this a problem?)  it also happens most frequently with the lens pointing straight down. (

[rafadavidc]

 bump?
 
--RC

[mjvit]

 1)Any way to:
 Convert Pentax bayonet mount lens (like K-1000)to (Spotmatic 2) screw type?
 
 2)Any recommended used lens stores - either brick & mortor or on-line?

[rafadavidc]

 there are bayonette-m42 adapters, just as there are m42-bayonette adapters.
 
i strongly recommend keh.com
 
--RC

[Glenn Middleton]

 You can mount M42 lenses on a K bayonet camera but if you use a K bayonet lens on a M42 mount camera, via an adapter you cannot focus to infinity.The bayonet is of a larger diameter than M42 and the focal plane to flange distance too similar to allow t

[melvin g. krick]

 Hello. I have the same mirror stays up problem that rafadavidc has posted. Can anyone tell me the solution? I don't want to take the Spotmatic apart and repair cost by a repair shop would be way to high. Is lube on the moving parts on the bottom of the