I got this lens in a lot sale. It's small, is a wheel stop, and it covers 4 x 5 at least, because that is what I tested it on. I am confused over the aperture numbering system though. It goes, as far as I can read ...64, 22, 16, 512, 256, 128 from 64 as the smallest to the largest 128, which seems all over the map! I've looked on the web for a comparable numbering system, US and European and haven't come up with anything. Closest I've come is Wikipedia where the closest numbers were the Zeiss old lenses, but I don't think they were in the same order.
There are no identifying marks on it. No name, or engraving but at least it came with a battered looking flange that fits fine.


I'm just shooting with it saying to myself " tiny, very small, small, medium, a little more than medium and a bit smaller than f4, because that is what 128 looks like to me.

I would like to know if anyone has seen a numbering system like this. I'm curious.Click image for larger version. 

Name:	mystery lens.JPG 
Views:	36 
Size:	21.5 KB 
ID:	173278Click image for larger version. 

Name:	side view.JPG 
Views:	37 
Size:	26.6 KB 
ID:	173279

Thanks