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12-15-2015, 05:05 PM   #1
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Pentax 6x7 to Canon FD adapter

Does anyone know when this adapter was manufactured? Or any literature about it from Pentax? I have been researching this for years & can't find anything about it. Believe it was a mid 70's item.

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12-15-2015, 05:34 PM   #2
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QuoteOriginally posted by denik Quote
Does anyone know when this adapter was manufactured? Or any literature about it from Pentax? I have been researching this for years & can't find anything about it. Believe it was a mid 70's item.
I would guess that it is a third party adapter. I'm fairly certain that Pentax never made a 6x7-FD adapter.
12-15-2015, 05:40 PM   #3
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My understanding is that the P-adapters* were Canon products. You might find someone with knowledge on the MFLenses forum Web site or a site that is focused on vintage Canon cameras.

http://forum.mflenses.com/

Steve


* There was also an N-adapter (Nikon F) and an E-adapter (Exakta)

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12-15-2015, 08:33 PM   #4
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Searching through the googles turns up a "P-Adapter" that mates 6x7 lenses to M42 and looks identical to the lead picture here but for the ring on the camera side. Perhaps it has an M42-to-FD adapter?

Pentax 67 f. M42 P-Adapter For 6x7 Lens // 22617,13
M42 lens on a FD body

12-15-2015, 11:40 PM   #5
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Yes. It looks like a Pentax brand 67 to M42 adapter with a generic M42 to FD adapter.
12-15-2015, 11:49 PM   #6
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It has the same rib ring design as the P adapter to 42. The 6x7 to K has ribs the same as body caps. I bought both from KEH around 1993 since I used 6X7 & MX along with my Canon F1N. Lens adapter on back is a custom Canon Breechblock
that is thinner than Canon's. There is also a slight height difference for correct distance to film plane on F1N. I have never seen another one since I bought mine. This may have been pro only adapter. I'll contact B&H to see if any knowledge of this.

---------- Post added 12-16-15 at 01:51 AM ----------

Steve, Canon's adapters were called Converters.
12-16-2015, 08:27 AM   #7
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I think what they're saying above, is that you have one of these threaded onto the back of a 6x7 to M42 adapter.

As you can see, Canon's M42 to FD adapter was quite thin.
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12-16-2015, 08:48 AM   #8
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As far as I know Pentax made three 6x7 lens adapters:

35mm M42 Mount to P6x7 (1969 to ??)
35mm K Mount to P6x7 (1975 to ??)
645 Mount to P6x7 (1984 to ??)

Phil.

12-16-2015, 10:41 AM   #9
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Mystery solved! It is an original P 42 adapter with the Canon Lens Mount Converter P screwed on. I mounted it on my F1N & when taking it off it unscrewed. Locking it on body did the trick. I may have matched it up if I would have had a CA-P on hand. However, not sure if the correct distance is retained on Canon bodies as never tested it recently as sold my last 6X7 lens in 2005. Glad to have CA-P back as it does have correct distance to film plane & now can use my old SM Takumars on my F1N again. Another view of the adapter mounted. Thanks to all replying.
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12-17-2015, 08:37 AM   #10
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It should have the correct registration when mounted on an FD body. The Canon M42 to FD adapter preserved infinity focus for those who wanted to mount Takumars onto their F-1's etc. And since the 6x7 to M42 adapter did likewise for Spotmatic owners, everything works.
While there many pitfalls trying to adapt lenses to other mounts, in this case you should be good. The only question now is whether any 6x7 lenses can do anything better than a smaller, lighter, and now dirt cheap original FD lens can do.
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