"DO NOT wind or trip the shutter with the lens removed!" Good tip - thanks.
In my reading, I did note that the 26m isn't the original lens, but I figured it should be sufficient for f5.6 or f8 which is where I plan to use this rig.
I had also picked up an Industar 53mm 61 L/D to see what the fuss was all about. I also can't shake the feeling that I ABSOLUTELY NEED a new 50mm Sonnar.
Obviously, I've been afflicted by a bad case of 50mm GAS. 😉
Cheers!