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08-26-2008, 11:41 AM   #1
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Stock M42 Mount Threads vs. Adapter Threads

Has anyone noticed that the thread cylinder on a Pentax adapter seems to be a bit deeper than that of a stock M42 mount (i.e. on an M42 camera body)? It seems that my adapters require a bit more turning in comparison to a Spotmatic F mount.


08-26-2008, 01:20 PM   #2
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I'll take a look when I'm home. I do know that my SMC 28/3.5 won't screw all the way in on the SP1000 and the Pentax K adaptor. But it will, happily, with the Fuji ST605, the Bower K adaptor, the Pentax bellows, and a Vivitar extension tube.

now that you mention it, I do have the impression of turning... and turning... with the Pentax adaptor.

Maybe the thread goes deeper, but based on the experience above, maybe the thread starts sooner.
08-27-2008, 07:32 AM   #3
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I get the same impression: turning and turning. It is no big deal, but I thought it an interesting little subtlety.
08-27-2008, 08:02 AM   #4
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Just tried it using a genuine Pentax Mount Adapter B, a K100D Super, and a 50mm from a Spotmatic. The removal of the lens from the Spotmatic required 31/4 turns, and from the K100D S 33/4 turns. What does this mean? Beats me.


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