Hello from France!
The problem is solved, good news, so here is some additional info for those who would like to use a 360 mm 5.6 Symmar,
I have found this other vintage brochure
https://www.photrio.com/forum/attach...5-6-pdf.79242/
Probably more recent, published after Compound #4 shutters were discontinued.
The data-sheet says that the 5.6 / 360 Symmar is mounted on a COMPUR 5FS size#5 shutter, probably with reducing rings to fit Compound #4 thread sizes?
Another 6.8 / 360 Symmar version is mentioned on a #3 shutter.
However, It is not granted that 5.6 cells could be mounted on a #3 shutter even with a max aperture reduced to 6.8 .
May be Schneider redesigned the lens barrel and lens element diameters to be compatible with a #3 shutter?
After Symmars were discontinued (at the end of the sixties?), 360 mm Symmar-S and, later, 360 mm Apo-Symmars were limited to 6.8 and mounted on a #3 shutter.
Bookmarks