2 Mar
2005
2 Mar
'05
9:26 a.m.
From: "Tom Jennings" <tomj at wps.com>
Unlike film, you can'y simply open the shutter and integrate the
image over time arbitrarily. CCDs are extremely noisy; silver
nitrate (etc) it's at atomic scale.
Hi
Actually, once compensated, CCD's have much more
dynamic range than film. They can be used to integrate
over long periods of time ( usually cooled ). They
have issues but don't confuse poorly compensated
camera's with the ability of a CCD.
Dwight
2 Mar
2 Mar
11:24 a.m.
> From: "Tom Jennings" <tomj at
wps.com>
>
> Unlike film, you can'y simply open the shutter and integrate the
> image over time arbitrarily. CCDs are extremely noisy; silver
> nitrate (etc) it's at atomic scale.
On Wed, 2 Mar 2005, Dwight K. Elvey wrote:
Actually, once compensated, CCD's have much more
dynamic range than film. They can be used to integrate
over long periods of time ( usually cooled ). They
have issues but don't confuse poorly compensated
camera's with the ability of a CCD.
I realized astronomical cameras for example use CCDs, most
definitely cooled, for very long integrations, but the context of
the conversation implied hand-held, non-cooled, ordinary, cameras.
I wasn't slagging CCDs or holding chemical film on high (though
would that be out of character for this list? :-); just wanted to
point out things aren't simply linear like that.
7235
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7235
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