Thanks, everyone, for your replies to my post. It's all very useful information.
Bioskop asked if I was speaking about the Kowa for Bell & Howell. Mine doesn't say Bell & Howell on it, just "Kowa Prominar Anamorphic 16-H."
I had been eyeing up a Berogon 35mm f//3.5 lens because its zebra-pattern matches my anamorphic, and so seemed aesthetically suited to the lens (e.g., '> ).
I've decided instead on an SMC Pentax-M 35mm f/2 lens because it'll open wider — plus I'm oddly partial to Pentax lenses ever since getting my first film camera, a Pentax ME-Super, as a teenager.
This 35mm lens arrives soon, so I can see how it works for my purposes. ;-)
Stefan