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09-21-2020, 12:06 PM   #1
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Pentax auto 110 ( super ) mount adapter for K-mount lenses

I want to equip my pentax cameras, both Auto 110 and Auto 110 Super, with a 135mm and a 200mm lens from Pentax and possibly a Sigma 400mm.

Now I am experimenting with a defective 50mm 110 mount and an extension ring K-mount but it doesn't work very well. The small lenses have a lot of plastic and are therefore difficult to renovate.

Does anyone know if such an adapter exists and where it can be bought?





09-21-2020, 12:32 PM   #2
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Those are some cute cameras. I have a Pentax 110 20–40mm lens I've adapted for micro 4/3. But sorry, no idea how to adapt them to go the other way up to APS-C.
09-21-2020, 02:01 PM   #3
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QuoteOriginally posted by PocketPixels Quote
Those are some cute cameras. I have a Pentax 110 2040mm lens I've adapted for micro 4/3. But sorry, no idea how to adapt them to go the other way up to APS-C.
I don't think that's what he is saying. It sounds like he wants to put a k mount lens onto the 110 body. But I could be mistaken.
09-21-2020, 05:37 PM   #4
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If you are after a 110 mount to try adapting, the 20-40mm zoom has a rear mount that can be taken off with 4 screws, all the other 110 lenses seem to have the mount integrated into the lens. Another thought would be to deglass the soligor teleconverter and use that tube to epoxy a K mount on. I have one made with plenty of epoxy and an M42 screw mount. Good luck

09-22-2020, 12:35 AM   #5
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QuoteOriginally posted by UncleVanya Quote
I don't think that's what he is saying. It sounds like he wants to put a k mount lens onto the 110 body. But I could be mistaken.
Exactly, that is what I want.
09-22-2020, 05:58 AM   #6
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What about using a 110 to micro 4/3 adapter or similar Sony adapter as the basis, and adding that to a 3d printed adapter?
09-22-2020, 10:47 AM   #7
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So I'm not the only one who wants to do this. I would love to try and stick some of my K or M42 lenses in front of my auto110 mostly because of the silliness of it. If someone had a good technical drawing of the respective sides of the mounts machines or 3d printing one seems like it would be doable. It isn't like there are still patents still covering the basic mechanical design of either. A 3d printed one would likely be good enough given the light weight of the camera.

11-20-2020, 11:34 AM   #8
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Fascinating idea. Big 35mm lenses on 110. Just like many of us do on the Q.

Thanks,
barondla
11-20-2020, 08:24 PM   #9
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QuoteOriginally posted by UncleVanya Quote
What about using a 110 to micro 4/3 adapter or similar Sony adapter as the basis, and adding that to a 3d printed adapter?
Rethinking this that wouldn't work. The mount registration distance of the 110 is 27mm. The K is 45.46 giving a max of 18.46mm to use for the adapter. I wonder if you could use the Soligor 1.7x 110 teleconverter as the base of the adapter and then marry it with a short k mount extension ring? You might have to machine some type of adapter plate or 3d print one if only lighter k mount lenses are planned to be used.
11-22-2020, 07:20 AM - 1 Like   #10
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I have several 1.7 converters but I don't think they are suitable. The length is 11.2mm (0.441inch). But it is just as small in diameter as the 24mm lens. I myself am thinking of using parts of a clouded 70mm in combination with a k-mount macro ring. The base of the 70mm is much wider and will be easier to fit into a k-mount macro adapter.




I have also seen the solution below. A 400mm with a T2 connection and a milled adapter.

11-22-2020, 07:34 AM   #11
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QuoteOriginally posted by beeperhorrie Quote
I have several 1.7 converters but I don't think they are suitable. The length is 11.2mm (0.441inch). But it is just as small in diameter as the 24mm lens. I myself am thinking of using parts of a clouded 70mm in combination with a k-mount macro ring. The base of the 70mm is much wider and will be easier to fit into a k-mount macro adapter.




I have also seen the solution below. A 400mm with a T2 connection and a milled adapter.
That 400 looks awesome. I get the point in the Soligor, I was thinking more about the mount components, but a bad lens makes sense also - more since it has a lot more space.
11-24-2020, 01:50 PM   #12
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That machined adapter is what I would be after. Just get K-mount on the far end and all will be good. Where was that taken from?
11-25-2020, 08:35 PM   #13
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QuoteOriginally posted by beeperhorrie Quote
I have several 1.7 converters but I don't think they are suitable. The length is 11.2mm (0.441inch). But it is just as small in diameter as the 24mm lens. I myself am thinking of using parts of a clouded 70mm in combination with a k-mount macro ring. The base of the 70mm is much wider and will be easier to fit into a k-mount macro adapter.




I have also seen the solution below. A 400mm with a T2 connection and a milled adapter.
That is an impressive custom adapter. Would love to see some of the pictures taken by the owner.

Thanks for sharing,
barondla
05-26-2021, 12:48 PM - 2 Likes   #14
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It is done!!!!

Made a test. A macro ring combined with a defective 18mm Pentax 110 lens. Just on M42 thread, so I can now use all older Pentax 35mm lenses.
I don't have one yet, but I can look for it now. First I will look for a 200mm. It must stay Asahi Pentax and these test models are all defective, so no loss here. Now I know that it works so I can go for it with better lenses.
With a 135mm I have an equivalent for 270mm. The sought after 200mm equates to 400mm for 35mm.
Imagine: An Asahi Pentax SMC f13.5-2000mm becomes a 4000mm!

















These two are about the same. The Pentax with a 135mm is almost equivalent (270mm) to the Nikon with the 300mm. A lot shorter and less weight though.
05-27-2021, 09:26 PM   #15
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QuoteOriginally posted by beeperhorrie Quote
It is done!!!!

Made a test. A macro ring combined with a defective 18mm Pentax 110 lens. Just on M42 thread, so I can now use all older Pentax 35mm lenses.
I don't have one yet, but I can look for it now. First I will look for a 200mm. It must stay Asahi Pentax and these test models are all defective, so no loss here. Now I know that it works so I can go for it with better lenses.
With a 135mm I have an equivalent for 270mm. The sought after 200mm equates to 400mm for 35mm.
Imagine: An Asahi Pentax SMC f13.5-2000mm becomes a 4000mm!
















These two are about the same. The Pentax with a 135mm is almost equivalent (270mm) to the Nikon with the 300mm. A lot shorter and less weight though.
Cool project! Can't wait to see some results. One thing to keep in mind. 110 lenses don't have adjustable apertures. The system is set for F 2.8. The further your adapted lens is from this, the greater the exposure error. Luckily negative film has lots of latitude.

Thanks for sharing,
barondla
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