300mm f5.6 Plasmats are going to be in a Copal# 3 regardless if they are APO Sironar, Nikkor W, Symmar_, Fujinon _.
All will be HUGE. More similar than different regardless APO, Schneider, Fujinon, Rodenstock, Nikkor.
300mm f9 APO ronar and similar can be had in a Copal# 1 shutter.
Significantly smaller.
Left is a 300mm f5.6 Symmar S Copal# 3, Right is a 300mm f9 APO ronar Copal# 1.
Focal lengths are essentially identical, which to use, depends on image needs.
Bernice
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