The colors are more saturated in this shot- The grain still looks digital to me. Interesting.
The late-run Summitars reverted back to the Hexagon shaped/double set of aperture blades of the Summar. The only advantage that I can think of: reduce focus shift due to spherical aberration. My speculation- same reason that Zeiss Opton moved to the oddly shaped aperture shape.
The switch was somewhere in the early 1950s. I kinda figured it was because they wanted to get rid of some left-over stock of aperture parts, possibly from the Xenons or Summars, before introducing their new shiny summicrons.
1+100 Stand developement Fomapan 100 Classic in R09 "One-Shot". I was not using enough concentrate per roll of film in the tank unfortunately. So these are all rather dark and grainy. You live and learn...or at least you live.
I have a couple of Summitar filters, but I've only used the Y0 (GBOOM)
If I come across them at the Photographica Fair for the right price I sometimes pick them up.
But they're rarely at the right price. 20 Euro is too much in my opinion.
I think I've got a blue and green one lying around. I believe one wasn't even an original Leitz filter. Walz maybe.
DAG made me a filter adapter for the Summitar by taking an old Summitar filter with bad glass (which I supplied), removing the glass and gluing in a 39mm female thread. This worked nicely on the M8, where I needed to use an IR cut filter). He warned me that it might vignette on full-frame Leicas. I haven't tried yet. IIRC he recommended making a Summitar to 46mm adapter for film or full frame. This is probably something that any competetent and willing repair person could do.