ancient 21\4 for F on Cameraquest website

[phofseth]

I just read the excellent pieces on small rangefinders and continued on the s.Gandy 21mm piece..

I noticed, however that the pictures did not look like my former 21\4
which did not have a round rear element, but a cutoff surrounded by a metal shroud.​

I made a Leica screw mount adapter for it and used it succesfully on my IIIg: as long as the lens was mounted after the adapter​

Many years ago I gave it away to a Nikon collecting friend, so no pictures available, but Bjørn Rørslett who received it, might have published some snaps. on his naturfotograf site.​

p.
​

 

[jonmanjiro]

I noticed, however that the pictures did not look like my former 21\4
which did not have a round rear element, but a cutoff surrounded by a metal shroud.​

That would be because your lens was for Nikon F-mount. The cutoff on the rear element is required so the lens clears the mirror. The cutoff isn't needed on the S-mount version because there is no mirror to for the lens to clear between the lens mount and the shutter.​

https://www.cameraquest.com/nrf_21_4.htm