Benoist Berthiot 100mm f2.2 Cinestar N2. My second lens project with the lathe, which turned out much better than the last one.
I assume that this lens was probably derived from a cine lens, since it has a name like Cinestar. The lens covers full frame, even at infinity. But the lens was really made for 16mm projectors, so even when there is no vignetting, the edges are mushy. But this is not a landscape lens, edge sharpness is not important at all. For the kind of pictures that are normally taken with a lens like this, rendering character is far more a consideration.
I put this lens on the lathe last night and turned it enough just to remove the grooves on the lens, and slip on a 37-52mm step-up ring, and it goes on a modified Vivitar 2X macro teleconverted helicoid. The lathe job is much much better than my last attempt. I used a 4-jaw chuck, and with the aid of a dial indicator, I was able to get the lens to turn pretty round, hence the much smoother finish.
Sitting at the dock of the lake - Benoist Berthiot 100mm f2.2 Cinestar N2 & Sony A7.
This lens can create some interesting portraits, like the 150mm version does. I think I will explore more with this interesting gem.
Swirly Bokeh - Benoist Berthiot 100mm f2.2 Cinestar N2 & Sony A7
Man & his best friend - Benoist Berthiot 100mm f2.2 Cinestar N2 & Sony A7