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Re: [OM] [semi-OT] one advantage of digital cameras

Subject: Re: [OM] [semi-OT] one advantage of digital cameras
From: Tom@xxxxxxxxxxxxx
Date: Fri, 11 Jan 2002 15:09:34 -0500
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-
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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 
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"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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