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09-17-2009, 07:11 PM   #1
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m39 to m42 to k

First I tried to search for m39 - as it is only 3 characters it wouldn't let me do the search. Basically are there any decent enough m39 lenses that a m39 to m42 to k mount adapter setup would be worthwhile? Would a double adapter work?

09-17-2009, 09:30 PM   #2
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I'd like to know the same thing...can anyone comment on m39 to K?
09-18-2009, 07:43 AM   #3
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does anyone know???
09-18-2009, 09:06 AM   #4
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I found a link last night (which I can't find now) that shows a thread adapter for M39 to M42, which is the attached to a M42 to K adapter. The thread indicated that you must cover the two slots on the adapter or light will get in and the shots will be soft.....

09-18-2009, 10:26 PM   #5
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QuoteOriginally posted by soycory Quote
First I tried to search for m39 - as it is only 3 characters it wouldn't let me do the search. Basically are there any decent enough m39 lenses that a m39 to m42 to k mount adapter setup would be worthwhile? Would a double adapter work?
This is an interesting set of adapters.

Do you realize that using both adapters, you can use lenses from a 1954 Asahiflex (Pentax predecessor, waist level viewfinder) on a brand new, just issued K-7 digital SLR? The adapter was issued in 1957 when the Pentax came out so that Asahiflex users could use their lenses on the new and marvellous pentaprism equipped Pentax camera?

Of course everything would be completely manual, and as mentioned in this thread, the 39mm lens won't cover the bayonet gaps without a bit of tape, but that is a 55 year old lens that will focus to infinity on the latest and greatest. Just think, you can tell those other camera people that you are using a 55 year old lens for a few dollars worth of adapters. Talk about bling - or gnilb - bling in reverse.

PS, there were other cameras that used 39mm lens mounts ...
09-18-2009, 11:50 PM   #6
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The short answer is yes, you can do it. If the lens was intended for an M39 SLR everything should work fine. If the lens was designed for a rangefinder with a film to flange distance shorter than Pentax's then the lens will not focus to infinity (and may only be useful for macro distances).

I have an M39 enlarger lens for my bellows that mounts using M39 to M42 and M42 to K adaptors.

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/59325-possible...39-pentax.html
09-19-2009, 10:43 AM   #7
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sounds interesting. thanks for your responses
09-19-2009, 10:53 AM   #8
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The Asahiflex lenses were m37 with the exception of the very last bodies which were m42. M39 to M42 adapters however are quite common.

09-19-2009, 04:30 PM   #9
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QuoteOriginally posted by Blue Quote
The Asahiflex lenses were m37 with the exception of the very last bodies which were m42. M39 to M42 adapters however are quite common.
I sit corrected. I always thought the Asahiflex were M39, like the Exakta. My bad.
09-19-2009, 04:45 PM   #10
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QuoteOriginally posted by Canada_Rockies Quote
I sit corrected. I always thought the Asahiflex were M39, like the Exakta. My bad.
Its a common misconception. Its mostly collectors that are aware of this. There were a few other lens manufacturers that made lens in the m37 mount for the Asahiflex bodies. As far as I know, only the Asahiflex bodies used the m37 mount. For example Carl Zeiss made an 80mm f2 Biotar with m37 mount. It is one of the most gorgeous lenses I have ever seen.
09-19-2009, 05:38 PM   #11
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Here's an M39 to Kmount adapter.

M39 Lens to Pentax PK K100D K200D K10D K20D Adapter - eBay (item 250486808251 end time Sep-21-09 23:16:02 PDT)
09-19-2009, 09:48 PM   #12
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That one is flanged so you might loose infinity focus. I've got a Russian M39 Helios 44 and I use this step down ring with a genuine Pentax M42->K adapter.
09-20-2009, 03:11 PM   #13
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I go the same path as Ovim, genuine Pentax M42 adapter with the M39 to M42 adapter which works fine.
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