On Friday, January 11, 2002 at 10:04, Daniel J. Mitchell
<olympus@xxxxxxxxxxxxxxx>
wrote re "[OM] [semi-OT] one advantage of digital cameras" saying:
> http://www.elphel.com/model303/index.html
>
> "...10 ns minimal exposure time..." -- so that's 1/100,000,000th of a second
> exposure. You'd need one heck of a shutter to get that sort of thing
> mechanically.. (I wonder what ISO equivalent the CCD on _that_ is, though?)
>
> -- dan
Probably no shutter. I think gated arrays initialise, read, reinitialise
the pixels - at 100 Mhz. Now that's slow motion video! Should fill a large
disk or tape rather fast.
They did made shutters faster than that in the 40's. See
http://simplethinking.com/home/rapatronic_photographs.htm
But you need an awful lot of light to get enough photons to visit in 3 to
10 ns.
tOM
------------------- http://groups.yahoo.com/group/ottawa-
photo-clubs
tOM A. Trottier, ICQ:57647974 http://abacurial.com
758 Albert St, Ottawa ON Canada K1R 7V8
+1 613 860-6633 fax:231-6115 N45.412
W75.714
"The moment one gives close attention to anything,
even a blade of grass, it becomes a mysterious,
awesome, indescribably magnificent world in itself --
Henry Miller, 1891-1980
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