Well, it's an old Carl Zeiss lens for Contax Rangefinder, together with a Leica M3.
Unfortunately, I dont have the fitting camera....
The finder is a revolver finder from Zeiss, too. I am using it, because I dont have a single one for 21mm. If you turn it, it will show up framelines for 21, 35, 50, 85, 135mm. 🙄
Well, both things do not really fit the camera. The Contax RF to Leica M mount adapter is really badly made and the lens do not really fit well. I would not recommend this.
The finder also works in infinity position only, otherwise, it will scratch the top of the camera.....
I will give it a try anyway as I have the lens but not the right camera for it.
I should buy me a Contax RF, I think! 🙂
Jan.