Interesting, Kevin. My Apo Nikkor process lenses are also fairly late, and were installed
with multi-bladed apertures, well after these kinds of apertures were disappearing from
most taking lenses with shutters. An exception would be the late Kern dagors in Compur. Maybe this was just how the production lines worked. Certainly once the classic Copal 3s shutter disappeared, the newer Copals had less blades. Makes me
tempted to retrofit certain optics onto the older shutters; but it's generally much more
cost effective just to buy an older lens for the instances like portraiture where selective focus and good bokeh are desirable.
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