Do Leitz Hektor 13.5 work on Screw mount Zenit SLR ?

Do Leitz Hektor 13.5 work on Screw mount 30 years old black Zenit SLR ? I wish.

It does fit but will only focus at close range as the body is deeper (SLR). https://camerapedia.fandom.com/wiki/Zenit_3M

If your Zenit SLR has the M42 mount then the film to flange distance is 45.46 mm. A Leica screw mount lens has a considerably shorter film to flange distance so perhaps a recessed adapter might be possible. If you are not interested in correct infinity focus then just about anything can be adapted. The space between 42mm and 39mm (3mm in total or 1.5mm between circumferences) would make such an adapter difficult to manufacture. A stepped adapter is easier to make but precludes correct infinity focus. The Hektor is a thing of beauty but it isn't very sharp when compared with more modern 135s. You might like it for portraits.

Mustafa Umut Sarac said:

Do Leitz Hektor 13.5 work on Screw mount 30 years old black Zenit SLR ? I wish.

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If it's really 30 years old, it'll be m42, so you would need an adapter and it would never focus to infinity. I've done a lot of macro work with rangefinder lenses on slrs, but that's about all you can do.