I was so delighted with the Summicron-M 28 ASPH the other day, it piqued my curiosity to do some test shooting with the most maligned Leica lens, the ancient Hektor 135mm f/4.5.
I had an older version of this lens, once upon a time, that was part of my father's dental work recording kit. The one I found a few years ago, for the princely sum of $180 in near mint condition (the correct lens hood and cap were actually more expensive than the lens!) is a 1960 example.
So I fitted it to the camera with an orange filter and hood, added the Visoflex 020, set it to f/8 with auto exposure and AutoISO, and went for a walk.
Bicycles For Sale - Santa Clara 2023
Leica M10 Monochrom + Hektor 135mm f/4.5
ISO 2500 @ f/8 @ 1/750
I made 40-some exposures and at least 25 of them are very satisfying! I certainly wouldn't call the old Hektor "bitingly sharp" like a modern lens, but on the other hand it certainly is not a bad performer, and it's light and even hand-held usable.
Probably the most difficult part of getting a critically focused image with this lens is the fact that the focusing helicoid is very fine threaded and you have to concentrate carefully on the RF image alignment to get it right on the money. Live View with the M10-M provides another focusing option that provides an easier critical focus capability...
Note: this photo was focused with the rangefinder.