[jpfisher]

It could also work with a Q if you could find an adapter . almost any lens made can theoretically be adapted to the Q

Good point--but I'd wonder about performance, considering the size of the sensor... what does that make a 50mm? [Google] 280mm! Would be interesting in seeing the results with something like the Summarit, which is not a particularly sharp lens at wider apertures.

Re: fitting 110 lenses on the K-01. I have an 18mm Auto-110 lens that I use on a Sony NEX body. Corners are soft with some light falloff, but I am pleasantly surprised by the results every time I shoot with it. Not possible to adapt it to the K-01 and focus to infinity. However, if you do want to go the legacy lens route with that body, old Nikkors might be possible, and if you swap the mount out, Leica R glass would work as well--Leitax.com has all the info on the latter.

And, of course, old K-mount glass works quite nicely. I enjoyed using the Pentax 28mm f/3.5 on the K-01 for the time that I had the camera.

[RonHendriks1966]

Why? They will only work wide open, they won't focus to infinity, and they will vignette. It would be interesting if someone would make an adapter that could control aperture for the Q.

They don't vignette, I just cut out the bright part of the picture and lie to you

[RioRico]

A slightly delayed response:

How to tell LTMs (28.8mm register) from M39s (45.46mm register) ??

* LTM: If they're made by or for Leica. If they're sold as being for Kiev or Fed etc RFs.
* M39: If they're Soviet-made and they're being sold for Zenit or other SLRs.
* There's also a structural difference that I forget right now. Somebody help me!

Which adapters to use?

I buy cheap M39-M42 rings from China by the boatload. Almost. Not just to adapt M39 and L39 glass to Pentax, but also for Exakta-mount lenses. I got trashy rings from Ukraine for about US$1 each shipped; the much better Chinese rings are about US$2 shipped, in quantities of 10. For PK mount, I put a cheap thin-flange clone M42-PK adapter over the ring and tighten them both down, using a PK rear lens cap as a wrench.

If infinity is not an issue, I may use fairly cheap safe wide+thick-flange M39-PK adapters, about US$5 each shipped. I often use these with L39 enlarger lenses I'm sticking on a PK bellows or tubes. If infinity is *really* an issue and the lens isn't too heavy, there's a simple cheap trick: Get a thick black 3rd-party PK body cap (about US$2 each). Cut a hole in it. Screw in the lens. Adjust for infinity focus. Apply glue. Voila!

I use that last trick to mount Argus-C3 (The Brick!) RF lenses on my K20D. This trick will NOT allow use of A110 lenses on a PK camera. I know; I've tried.

[minime]

A slightly delayed response:

How to tell LTMs (28.8mm register) from M39s (45.46mm register) ??

* LTM: If they're made by or for Leica. If they're sold as being for Kiev or Fed etc RFs.
* M39: If they're Soviet-made and they're being sold for Zenit or other SLRs.
* There's also a structural difference that I forget right now. Somebody help me!

Which adapters to use?

I buy cheap M39-M42 rings from China by the boatload. Almost. Not just to adapt M39 and L39 glass to Pentax, but also for Exakta-mount lenses. I got trashy rings from Ukraine for about US$1 each shipped; the much better Chinese rings are about US$2 shipped, in quantities of 10. For PK mount, I put a cheap thin-flange clone M42-PK adapter over the ring and tighten them both down, using a PK rear lens cap as a wrench.

If infinity is not an issue, I may use fairly cheap safe wide+thick-flange M39-PK adapters, about US$5 each shipped. I often use these with L39 enlarger lenses I'm sticking on a PK bellows or tubes. If infinity is *really* an issue and the lens isn't too heavy, there's a simple cheap trick: Get a thick black 3rd-party PK body cap (about US$2 each). Cut a hole in it. Screw in the lens. Adjust for infinity focus. Apply glue. Voila!

I use that last trick to mount Argus-C3 (The Brick!) RF lenses on my K20D. This trick will NOT allow use of A110 lenses on a PK camera. I know; I've tried.

Wow, that is really informative n creative. I hv purchased M39-M42 ring and a genuine Pentax M42 to K adapter. Will post the result here when I get them next week with photos.
That body cap trick sounds interesting will hv to investigate further.

Once again thanx for everyone's ideas n knowledge sharing. If anyone who has gone down this path n has photos to show , please share them

[Douglas_of_Sweden]

A slightly delayed response:

How to tell LTMs (28.8mm register) from M39s (45.46mm register) ??

* LTM: If they're made by or for Leica. If they're sold as being for Kiev or Fed etc RFs.
* M39: If they're Soviet-made and they're being sold for Zenit or other SLRs.
* There's also a structural difference that I forget right now. Somebody help me!

Which adapters to use?

I buy cheap M39-M42 rings from China by the boatload. Almost. Not just to adapt M39 and L39 glass to Pentax, but also for Exakta-mount lenses. I got trashy rings from Ukraine for about US$1 each shipped; the much better Chinese rings are about US$2 shipped, in quantities of 10. For PK mount, I put a cheap thin-flange clone M42-PK adapter over the ring and tighten them both down, using a PK rear lens cap as a wrench.

If infinity is not an issue, I may use fairly cheap safe wide+thick-flange M39-PK adapters, about US$5 each shipped. I often use these with L39 enlarger lenses I'm sticking on a PK bellows or tubes. If infinity is *really* an issue and the lens isn't too heavy, there's a simple cheap trick: Get a thick black 3rd-party PK body cap (about US$2 each). Cut a hole in it. Screw in the lens. Adjust for infinity focus. Apply glue. Voila!

I use that last trick to mount Argus-C3 (The Brick!) RF lenses on my K20D. This trick will NOT allow use of A110 lenses on a PK camera. I know; I've tried.

Rico, you are our own Dr. Frankenstein!

I've tried put c-mount lenses on my Pentax DSLR, or rather inside them. They are so narrow that if I lock the mirror in the up position I can slide them inside the camera through the bayonet hole. Thought I should be able to focus in that way and then maybe fix it by making a big hole in a body cap and push the C mount lens through that hole. Had that worked it should have been even easier on a K-01. But even the shutter takes too much place, so I cannot get the lens close enough to the sensor. What is the diameter of the smallest A110 lenses? Would they fit inside the mirror box?

This is really now propagating to something that belongs in the "impossible lens club".

[RioRico]

Rico, you are our own Dr. Frankenstein!

Is that a problem?

I've tried put c-mount lenses on my Pentax DSLR, or rather inside them.

C-mount is 25mm diameter. I got a 25-42 step ring (disc, actually) to try two Pentax Cosmicar lenses, a 50/1.9 and 12.5/1.8, on my K20D. The 50 is barely usable for close work, like an inch from the lens. The 12.5 is totally unusable. These lenses are great for Nex and useless most everywhere else.

What is the diameter of the smallest A110 lenses? Would they fit inside the mirror box?

My A110 18.2.8 isn't with me now, but I know that it will fit into a PK mirrorbox. I also know that it will not focus. The A110 register of 27mm is just way too short, even shorter than Leica. Caveat: If the Cosmicars are a model, then an A110 50mm lens might be usable for macro shooting. But these are more Nex fodder; no good on PK.

This is really now propagating to something that belongs in the "impossible lens club".

Nothing is impossible for a fanatic.

[minime]

I am devastated to report back my results.
NO GO!!!
As it turns out, it won't even focus at all with the M39-M42 ring on the Pentax original M42-K Mount adapter in the camera.
Obviously it's the LTM and not a M39 as some of you has already indicated.

Selling the lens now as it will be no good to me for now and I can free up the cash for some other lens that will actually work.

Here are some photos taken with the R 24/2.8 though.

Again, Thank for everyone who has given me the insightful opinion on this matter.

[Laurentiu Cristofor]

I am devastated to report back my results.
NO GO!!!

Shouldn't be a surprise by now, given that it was sold by a Leica specialist.

As it turns out, it won't even focus at all with the M39-M42 ring on the Pentax original M42-K Mount adapter in the camera.

It should focus, but just at a few centimeters away from the front element.

Obviously it's the LTM and not a M39 as some of you has already indicated.

M39 doesn't really mean anything. It is not as precise a name as the LTM name, which clearly identifies a mount. M39 can refer to both LTM and the unusual Zenit mount. That is why the Leica specialist confirmed it as an M39 lens. The question you should have asked is what camera it works for.