My friend Les loaned me this old Bausch & Lomb 100mm f/2.3 lens. He added a Nikon F-mount and focusing helicoid to it. I took it out and spent some time with it. It’s obvious from the image at the right that the lens is a bit soft wide open, but is much better by f/4 or f/5.6. That is shown in the second image below, that was shot at about f/5.6. The background is not quite as pleasant, but the image is much sharper.
The image quality is quite good and the bokeh is pleasant (smooth). It’s a good lens. The iris fascinates me — so many blades. So the aperture is nearly circular throughout the full range of stops.
It’s a really neat piece of vintage glass.