paulfish4570
Veteran
Raid, might you boil down your tests to a brief paragraph, or point me to where you gave the final opinions in words?

I just sent a Thorium Summicron to Focalpoint, the front surface had heavy cleaning marks. That puts me at three "Hot-Glass" Collapsible Summicrons, one early "regular" Collapsible Summicron, and two late collapsible Summicrons. I also have two type 1 Rigid Summicrons. Two of the Thorium lenses were bleached, but still give a yellow color-tint.
The late collapsible Summicrons are "within a hair" of the Rigid Summicrons for performance. I just like the collapsibles.
Brian,
So if my collapsible Cron is a late model lens without Thorium, then in your opinion it could still be excellent and even better than the collectible Thorium Cron.