Archived posting to the Leica Users Group, 2001/11/06

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: RE: [Leica] digit stuff for those interested
From: "Austin Franklin" <darkroom@ix.netcom.com>
Date: Tue, 6 Nov 2001 12:20:50 -0500

> In film, a 1
> micron square silver halide grain contains 20 Billion silver halide
> molecules, each capable of being hit (exposed) by a photon. It only
> requires three being hit to produce a developable speck. A digital sensor
> pixel (the minimum recording spot) is 5 microns square (25 sq.
> microns vs 1
> sq micron) and will ultimately report a light level of 0-255 (256 levels)
> for this whole vast area of 25 sq. microns. This is why Leica lenses out
> perform most other lenses on film, but are no better than
> anything else on
> pixels.

Excellent information Jim, thanks!

> And why film can record deep shadows and bright highlights in the
> same scene. Digital sensors cannot.

What is the latitude of digital sensors in your experience?  How does that
compare to film?

- --
To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html

Replies: Reply from Guy Bennett <gbennett@lainet.com> (Re: [Leica] digit stuff)
Reply from Jim Brick <jim@brick.org> ([Leica] Re: digit stuff: Underkill)
Reply from Jim Brick <jim@brick.org> ([Leica] Re: digit stuff: Underkill)
Reply from Mark Rabiner <mark@rabiner.cncoffice.com> (Re: [Leica] digit stuff: Underkill)