Roger:
Could be a focal plane shutter just behind the lens, or would this raise
other problems? In his computer images the lens appears to be about 2 ft in
diameter. Can one purchase negative film the size he's suggesting? And
handling it? Wow!
You can buy film that wide and I'm guessing processing it shouldn't be as
difficult as one might first think, the roll could be advanced, dropping the
film down into a bath feeder of the dev, wash/stop, fix and final wash..
Given the cost per sheet I'd imagine the minute cost of chemicals could even
permit dev straight to fix then wash. He might waste $1 worth of acetic
acid and thiosulfate, but eh - hardly here or there.
Well I've painted the hull of my boat, gone shopping, washed the car, run
the ferrets and started cooking dinner.. and I'm still not in the mood to
work out the aperture he'd be shooting at!
I'd guess like you Roger, the shutter is do-able as a roller shutter behind
the lens. but at 1000th of a second that slit is going to be pretty narrow
and will introduce diffraction softening .. unless it gets up a fair head of
steam before the slit passes the back of the lens then it could be wider.
He could also do it with LCDs but that would drop his light levels even
more. Another way could be venetian blind style shutter blades that sort of
do this
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