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02-12-2014, 07:42 PM   #31
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The dog would really rather you played "chase the stick" than putting that glass thing in his face, I think. Nice shot.

12-03-2015, 02:56 AM   #32
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I have the same issue as the original poster: the cheapo M39-M42 ring I got from the bay doesen't screw all the way into my (original Pentax made in Japan) M42-PK adapter. Very annoying... All the more since it goes into my Spotmatic and Zenit without problem. Did you find a solution?
12-03-2015, 07:31 AM   #33
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The M39 ring I got from Fotodiox will not thread completely into my Philippines made OEM Pentax adapters but will thread into my Japan made OEM Pentax adapter (labeled only PENTAX Japan - without ASAHI). The adapter threads into my Asahi Auto Bellows (screwmount) without problems.

Perhaps try a Philippines made Pentax adapter?
12-05-2015, 07:28 AM   #34
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I think I have solved my problem by wearing the threads (screwing in and out some twenty-odd times on a condemned spotmatic). I'm still weary to put the lens on lest I it get stuck in there... A drop of glue between the lens and the ring?

12-05-2015, 11:33 PM   #35
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Probably easier and potentially cheaper in the long run just to buy another ring from a different source. And hope it is has a thread more within tolerance of the M42 thread.
04-14-2016, 08:29 AM   #36
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QuoteOriginally posted by cpritchardv Quote
Hey everyone, thanks again for your help.

I ended up ordering another one off of ebay, and it worked fine. This was the ring I used. Camera 42 39mm M42 to M39 Lens Mount Adapter Ring Hood Filters for Leica Zenit | eBay

The lens seems to have no issues focusing to infinity. Im looking forward to playing around with it. Heres one of my first pictures after getting it on my k-5ii
You mentioned that infinity focus does not seem to be a problem, is it still the case? I guess the issue of M39 - M42 adapters has been discussed to death, but I didn't find a conclusive answer with a quick look through the forums. I am looking at an old Soviet lens with M39 mount. Trying to figure out if it can maintain infinity focus on my K5. This lens has a slightly shorter distance to the sensor, than K mount lenses (45.2mm vs 45.5). So is my understanding correct that basically I need to put this lens 0.3mm inside the body to maintain infinity focus?
04-14-2016, 08:46 AM   #37
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QuoteOriginally posted by IgorZ Quote
You mentioned that infinity focus does not seem to be a problem, is it still the case? I guess the issue of M39 - M42 adapters has been discussed to death, but I didn't find a conclusive answer with a quick look through the forums. I am looking at an old Soviet lens with M39 mount. Trying to figure out if it can maintain infinity focus on my K5. This lens has a slightly shorter distance to the sensor, than K mount lenses (45.2mm vs 45.5). So is my understanding correct that basically I need to put this lens 0.3mm inside the body to maintain infinity focus?
I was able to retain infinity focus with that lens. I haven't tried using any other M39 lenses though, so I can't say for anything else unfortunately.
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