Here is a Ukrainian Arsat lens. It is a K-mount lens, but note the element protruding from the mount (cf. green line). Will this lens cause complications with a modern Pentax DSLR? I read somewhere that a manufacturer of a particular line of Soviet K-mount lenses, possibly Arsat, modified the K-mount in such a way as to render their lenses incompatible with Pentax DSLRs. I wonder if this could be one of those lenses...

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[blacklens]

I have not seen this type os lens, but I think it is ok to use it on modern k dslrs, the protruding part seems to be a protective cover of rear element .
but the simplest way is have it a try. lol

I have not seen this type os lens, but I think it is ok to use it on modern k dslrs, the protruding part seems to be a protective cover of rear element .
but the simplest way is have it a try. lol

But it could interfere with the mirror?

[boriscleto]

If the protruding part is cut off it would probably work. As it is the protrusion will hit the SDM contacts.

[.a.t.]

Here is a Ukrainian Arsat lens. It is a K-mount lens . . .
.

Are you certain it's a K mount? If it were a K, wouldn't the cutout for mount lock be nearer to the aperture flag / lever?
I think it looks more like a Nikon mount.

If the protruding part is cut off it would probably work. As it is the protrusion will hit the SDM contacts.

Seems very plausible. I have a Soligor that protrudes like that. It will mount of course. But it is the only manual lens I have that causes complications with my K-r.

[boriscleto]

Are you certain it's a K mount? If it were a K, wouldn't the cutout for mount lock be nearer to the aperture flag / lever?
I think it looks more like a Nikon mount.

Yes, Nikon F has the lock cutout on the opposite side.

Are you certain it's a K mount? If it were a K, wouldn't the cutout for mount lock be nearer to the aperture flag / lever?
I think it looks more like a Nikon mount.

It is a K-mount lens.

[THoog]

Are you certain it's a K mount? If it were a K, wouldn't the cutout for mount lock be nearer to the aperture flag / lever?
I think it looks more like a Nikon mount.

+1 That looks like an F-mount lens. The aperture lever is on the opposite side of the lock notch, and the lens appears to have a slight rim overhanging the mount plate.

Edit: unless that notch at the top is not the only lock notch, and there is another one next to the aperture lever.

[stevebrot]

I think it looks more like a Nikon mount.

Yes, Nikon F has the lock cutout on the opposite side.

+1 That looks like an F-mount lens. The aperture lever is on the opposite side of the lock notch, and the lens appears to have a slight rim overhanging the mount plate.

With me that makes four in favor of Nikon F. There were a number of Russian and Ukrainian lenses that were made in Nikon F mount. Might the lens in question be an Arsat H 50/2?


Steve

With me that makes four in favor of Nikon F. There were a number of Soviet lenses that were made in Nikon F mount.


Steve

Yes, all of you were spot on. The Ukrainian seller, however, has listed it as a K-kount lens. I will notify him of his error. The lens is 50/2, yes.

Thanks a lot.

[Bob from Aus]

What happens if you hit it with a hammer?

What happens if you hit it with a hammer?

Hit it with a hammer? Do you mean the lens body or the protruding element? It's a rugged lens; can survive lots of beating, but not sure about a hammer...