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05-11-2016, 09:36 PM   #1
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Can I use outer bayonet Pentax 6x7 lenses on Nikon?

Hi, is there any converter for outer bayonet Pentax 6x7 lenses to Nikon-F?
Like SMC Takumar 400mm f4?
I know that for inner bayonet such converters exists (and actually I have one).

Thanks for info.

05-12-2016, 06:14 AM   #2
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I went to eBay and searched for "adapter pentax 6x7 nikon f" and within a few seconds found some that have the outer flanges. So yes, they exist.
05-12-2016, 09:35 AM   #3
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Thanks for info, I must have typed something wrong, or just overlook them. Sorry for that.
I've only found for inner bayonet
05-12-2016, 08:56 PM   #4
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Hi,
I am curious, what's the reason for using the outer bayonet mount? To have less vignetting? If this can make a difference, I would hope Pentax itself can produce a 67-645 adapter that uses the outer bayonet.

05-12-2016, 10:30 PM   #5
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I've tried this lens in a shop (400/4) on My P67 and didn't liked it.
Bought Nikkor 16/2.8 Fisheye Ai-s instead.
Topic can be closed.
Thanks for info.
05-13-2016, 12:52 AM   #6
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QuoteOriginally posted by whwang Quote
Hi,
I am curious, what's the reason for using the outer bayonet mount? To have less vignetting?
My assumption has always been that the outer bayonet is to distribute the weight over a larger area and thus reduce the compression/tension forces on the mount......drooping.

Bob
05-14-2016, 07:22 AM   #7
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While we're on the topic, is it truly an outer bayonet? Or is it a breech-lock with outer flanges? I think only the "inner mount" lenses have the push-and-twist action that is called "bayonet". The "outer mount" have that "hold steady while I twist this ring dammit why won't you stay in place whoops I almost dropped it" action that I associate with breech-lock lenses. https://en.wikipedia.org/wiki/Breech-lock
05-14-2016, 10:07 AM   #8
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The 6x7 outer-bayonet mount was used on the manual diaphragm telephoto lenses that were released in the early years of the 6x7 system.

When the 400mm and 800mm lenses were updated they switched to an automatic diaphragm and inner-bayonet mount. The 6x7 telephoto lenses that were never updated (600mm & 1000mm) remained the only outer-bayonet mount lenses. (The 500mm was released as an automatic diaphragm and inner-bayonet mount)

Not sure why Pentax went with the two mounts when the 6x7 system was released in 1969, other than the manual diaphragm??

Phil.

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