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06-30-2008, 01:18 PM   #1
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Join Date: Jun 2008
Location: Toronto
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M42 lenses

I apologize if this may somewhat obvious but; with the use of a m42 screw mount to pentax K mount is it possible to use old m42 mount lenses?

I'm confused/skeptical after i read this: Minolta Lenses on Pentax - Pentax Forum
about using minolta lenses on a pentax body with the right adapter.

Is there a problem with the Plane distance when using a m42 mount lens?

06-30-2008, 01:49 PM   #2
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Join Date: Apr 2008
Location: Berlin, Germany
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Posts: 1,381
from that same thread, quote,
Minolta AF - 44.50 mm
Minolta MD - 43.50 mm
Pentax M42 and K - 45.46 mm

So, no there is no problem with the plane distance when using M42 on PK.

But yes, there is that problem when you get the wrong adapter. Unfortunately there are M42 to PK adapters offered with a fat ring, which don't focus to infinity! Why they are still sold is beyond me.

Look for an adapter that looks like a tiny ring. It must sit solely inside the PK-mount and not 'come out'. So then the M42 lenses back will sit right on the orignial PK-camera bayonet front side, held inside by the flush ring.

Wrong adapter ('macro adapter' so to speak)
New M42 to Pentax PK Mount Lens Adapter - eBay (item 200235272518 end time Jul-03-08 20:54:44 PDT)

Right adapter
Genuine Pentax M42 PK adapter fit K10d k100d K20D K200d - eBay (item 140245653957 end time Jul-07-08 09:36:10 PDT)

The differences in shape are very clear. You can't be wrong with the tiny one (can't tell you about differences in the tiny 'right' ones, some say the original Pentax is the best)

Good luck,

Last edited by georgweb; 06-30-2008 at 02:10 PM.

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