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RE: filmscanners: Magnification of light - electronic shutter



On Fri, 15 Jun 2001 13:50:34 -0500  Lucans, Gunars (gunars@spss.com) 
wrote:

> I recently acquired my first digital camera and have also noticed with 
> that
> some low-light exposures were done at 1/15 and came out surprisingly 
> well.
> Does anyone know more about this?

2 aspects...

First that CCD's can have a much greater dynamic range than film. If the 
comparison is with slide, even a crummy CCD will pick up masses of detail 
where the slide film has given up and renders only detailless black. But 
better CCD's now match and exceed even colour neg's wide range now.

Second, film has a rolled-off response at the shadow end, meaning image 
density is less than proportional to image brightness. This gives 
extension, but poor shadow contrast. CCD's are inherently pretty linear. 
In the hypothetical situation that both extend to the same Zone value, the 
CCD will show livelier separation.

Regards 

Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner 
info & comparisons




 




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