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05-20-2014, 02:38 PM   #1
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Pentax Mount Bellows

I recently picked up these bellows for a buck. The camera mount side fits on my Pentax K10D, but I cannot fit any of my pentax lenses on the other end. (I don't have alot of lenses though)

What type of adapter/lens would be best to use with these bellows?

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05-20-2014, 02:48 PM   #2
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It looks like there's some sort of adapter on the other end. What do you see when you remove it?

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05-20-2014, 03:03 PM   #3
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It unscrewed, so there is a small thread..
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05-20-2014, 04:46 PM   #4
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Have you tried mounting a M42 screwmount lens? That count be what it's designed for.


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05-20-2014, 04:54 PM   #5
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It may be an M42 mount.

But there were also a few other threaded mount systems, I think early Tamron adaptalls were a thread mount, and I think a lot of medical/scoientific equipment used a threaded mount (T mount?)

Then there's also the M39 mounts common on Leica cameras.
It's unlikely that it's that though, bellows on a rangefinder seems to be a pretty useless combination to me.



What diameter are the threads? that could narrow it down a lot.
05-20-2014, 05:01 PM   #6
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The camera end appears to be M42 with a flanged adapter attached. The lens end is less obvious and it appears that something is missing. The camera end has an aperture actuator pin, but the linkage to the lens end is missing (should have a cable and a flipper).

I would be careful about attempting to mount a M42 lens. T-mount is 42mm in diameter, but a different thread pitch.


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05-20-2014, 05:24 PM   #7
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The lens end has internal linkage... I don't understand it, but where it is circled is the pin from the linkage under the gasket?
This linkage works, push on the camera end, it functions on the lens end.
I don't own a m42 lens, but unless somebody has a better idea, will see if I can pick up a cheap one to try it out.
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05-20-2014, 06:02 PM   #8
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QuoteOriginally posted by bkhphoto Quote
The lens end has internal linkage... I don't understand it, but where it is circled is the pin from the linkage under the gasket?
This linkage works, push on the camera end, it functions on the lens end.
I don't own a m42 lens, but unless somebody has a better idea, will see if I can pick up a cheap one to try it out.
That little nubbin might be part of what once was the aperture actuator, but it is much too small to reliably mate to the pin on most M42 lenses. The problem is that the pin position when the lens is fully mounted varies considerably, even between two copies of the same lens.


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05-20-2014, 07:04 PM   #9
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Thank you for your help.
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