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02-14-2010, 02:39 AM   #1
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M42 adapter. Convert lens instead of camera?

I bought this adapter on ebay M42 - Pentax PK adaptor, infinity capable, UK post free - eBay (item 270513188489 end time Feb-09-10 06:59:39 PST)

It works ok,and it gives infinity on my helios 44-2, but i have to mount it on camera and the screw the lens in place. What i realy would like is to make the lens PK, so i can change quickly between all my lenses. Is it any adapter that do this?

02-14-2010, 03:33 AM   #2
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Just use m42 lenses all the time and leave the adaptor on the camera.

Do a search in this forum - people have modified the adaptor by taking out the lock spring and then glued one to each m42 lens base.
02-14-2010, 04:48 AM   #3
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QuoteOriginally posted by Arjay Bee Quote
Just use m42 lenses all the time and leave the adaptor on the camera.

Do a search in this forum - people have modified the adaptor by taking out the lock spring and then glued one to each m42 lens base.
I am not sufficiently certain of my standing in the eyes of the Lord to try that technique. With the lock spring removed the only thing then holding the lens onto the camera is His hand, after all.
02-14-2010, 05:17 AM   #4
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QuoteOriginally posted by Mike Cash Quote
I am not sufficiently certain of my standing in the eyes of the Lord to try that technique. With the lock spring removed the only thing then holding the lens onto the camera is His hand, after all.
I tried it now and it works quit nice. Don't need glue and you need to twist with some degre of power to take it of the camerea. No way it falls off by itself. It would probably be good to make it a habit to feel if it's in place.

Thank's for the advice.

02-14-2010, 04:12 PM   #5
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buy an adaptor for every lens and remove the spring, on some adaptors the screw is long enough without the spring to lock onto the lens thread if it is replaced.
That's how mine is held onto my Helios and a few other lenses.
02-14-2010, 04:49 PM   #6
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Some people have even put a notch in the base of the lens so the lock pin will grab it, but that is not an option for every lens due to the size of the base.
02-14-2010, 06:02 PM   #7
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QuoteOriginally posted by Steve Beswick Quote
Some people have even put a notch in the base of the lens so the lock pin will grab it, but that is not an option for every lens due to the size of the base.
Not to mention that some lenses have historical and collectible value and doing so could reduce the value by a lot. I can't imagine doing that to an Asahi Kogaku 83mm or 100mm lens for example. I wouldn't even do it to my auto-tak 35mm f2.3.
02-14-2010, 06:05 PM   #8
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QuoteOriginally posted by Phaser Quote
I tried it now and it works quit nice. Don't need glue and you need to twist with some degre of power to take it of the camerea. No way it falls off by itself. It would probably be good to make it a habit to feel if it's in place.

Thank's for the advice.
I have 2 lenses that I'd like to see you try that with, although I'd require a $500.00 deposit on one of them
They're both pretty big lenses, and quite stiff to focus whenever it isn't hot outside.

02-15-2010, 06:29 AM   #9
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there was a really good post some time ago by a user of a 500mm Takumar.

he removed the locking tab, only to have his camera fall off because there was nothing to hold it on.

personally, I think unless you can use flanged adaptors (which have locking pin provision, and re-adjust infinity focus, you are better to leave teh adaptor in the camera and shoot M42 lenses with that camera, using a xecond body to shoot K mounts if you want to switch
02-16-2010, 11:45 AM   #10
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Filing or cutting a small groove on the base of a common M42 lens is neither difficult nor an abomination. It is simply a small modification that extends the usefulness of an old lens.


Dave in Iowa
02-16-2010, 01:43 PM   #11
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QuoteOriginally posted by newarts Quote
Filing or cutting a small groove on the base of a common M42 lens is neither difficult nor an abomination. It is simply a small modification that extends the usefulness of an old lens.


Dave in Iowa
Again it depends on the old lens. A common one sure. But modifications aren't needed to extend the usefulness of old m42 lenses. That's total mis-information. For example, there's a 83mm Asahi Kogaku Tak out there for ~ $880. If you were to buy it and grind the base to notch it as you say and turn around a year later and try to sell it, you would be in for an education.

Last edited by Blue; 02-16-2010 at 01:51 PM.
02-16-2010, 02:09 PM   #12
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I am not going to do any modification on this one for sure... my favorite lens. This one deserves the genuine m42 adapter.

Last edited by aleonx3; 10-08-2010 at 11:01 AM.
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