Dimensioned drawings/blueprints of Krasnogorsk K-3/SP-16 bayonet?

[Okto Simaia]

I've been Googling a bit with my three-years-of-classes level Russian and I cannot find any blueprints or service manuals for the Krasnogorsk cameras, particularly the SP-16/Krasnogorsk bayonet mount. Does anyone know if such documents exist in the wild, particularly in digital form?

[Aapo Lettinen]

the SP16 lenses have the flanges of different width and thickness so the SP16 lenses are not directly compatible with Krasnogorsk bayonet unless the lens is modified. I did the modification with dremel on one 10mm lens some 10 years ago, it was like grinding of 2/3 of the mounting flanges to get them mount to the Krasnogorsk

[Okto Simaia]

Thanks for the quick response.
There’s some confusion on that, although certianly this is true for at least some lenses, since I own one that won’t mount on the Krasno. 😛

What I have been led to believe by RAF and Olex and The Soviet Camera Website Whose Name I Forget is that there were multiple SP-16 mounts, and that one of them is directly compatible, and one is not. Olex has said so explicitly on this site. 
 

The conflicting information (which I believe to be in good faith and coming from informed sources on all sides) is why I’m hoping to find reference documents to be able to put that uncertainty to bed. 

Edited April 21 by Okto Simaia

[Aapo Lettinen]

Here is the SP16 lens I diy modified to work on the Krasnogorsk, just filed off material from the flanges until it fit to the Krasnogorsk and could be focused to infinity. I marked on blue the original flange to highlight how much material I had to take off.

so the cylindrical part diameter is the same on both mounts but otherwise they are not "compatible" in the sense that the SP lens could just fit to the Krasnogorsk without heavy butchering of the original mount and potentially manually trying to adjust the ffd of the lens until it seems to work correctly.

I have only seen plain Krasnogorsk lenses and plain SP16 lenses on sale, nothing in between. It was common in Soviet Union to have small batches of something special made as a test piece or for special purpose, maybe the dual fit lenses were some rare test run they made but there was not enough them to show up on ebay enough to get noticed regularly?

[Aapo Lettinen]

the Krasnogorsk cameras were made for entirely different use than the Kinor cameras (16sp and cx line) so I have no idea why they would have tried to make the lenses cross compatible as the Kinor lenses were better quality and there was no way a Krasnogorsk user would have got their hands to Kinor lenses in the use Krasnogorsks were made for.

The krasnogorsks were made for movie club hobbyist use meant to be simple and affordable . The kinors were made for tv and propaganda, clearly made for professional use only and I can't see a reason why anyone would have wanted to use cheap-o hobby lenses on Kinors back in the day when the available kinor lenses were two or three times the optical quality, had better mechanics and were more reliable.

[Okto Simaia]

18 hours ago, Aapo Lettinen said:

 have no idea why they would have tried to make the lenses cross compatible

To avoid duplicated effort, is my thought. Since the two mounts differ only in dimensions, it doesn't make a lot of sense to design a separate mount just to...keep amateurs from using pro lenses? It doesn't seem like there's anything to gain by modifying the SP16 mount (which IIRC came first).