I said "complete shutter *assembly*". That is shutter blades,
timing mechanism *and* iris diaphragm.
The iris is only part of it. Did you bother to look at his
latest set of images of that one item from many views? It has the
provisions for setting several (quite slow) shutter speeds.
The shutter happens to be open, so what was initially
photographed and presented in the puzzle was only the iris diaphragm,
but he has the whole shutter assembly there -- except for the lens
elements which screw in behind and in front of the iris and shutter.
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The aperature control is at the bottom. The top is a shutter
control. I don't see the shutter itself; perhaps the aperture and the
shutter are the same device, the film being insensitive enough to make
the small opening not a concern.
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