Nice shots but umm, about that second one, shouldn't you have framed down a little more?? I shouldn't complain though as you got most of what I wanted to see.
Here is a 2000px version of it. Very strange that it still makes stars from point light sources when wide open, I can see the aperture blades when the lens is wide open, I wonder if anyone has tried modifying it to open up further.
4 stops should be f4 so ... either 21/4 super angulon or 21/4.5 Zeiss or 21/4 color skopar? I'm thinking its the super angulon or it could be the tri-elmar