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Re: [OM] Re: The angle of light theory

Subject: Re: [OM] Re: The angle of light theory
From: w shumaker <rlist@xxxxxxxx>
Date: Fri, 03 May 2002 11:18:17 -0400
At 08:52 AM 4/25/2002 -0400, Steve wrote:
><snip>
>
>With the new Foveon full-color image sensor chip, where the three color
>sensors are stacked on top of each other, the angle-of-light issue might be
>even more critical than on CCDs in current use with sensors that register
>only one color (R, G, or B).

The Foveon chip uses depth into the silicon to separate the colors, and
then uses doped junctions with different depths to create photo diodes
to capture the individual color. The deepest junction is for red and is only
2 microns deep. I doubt that film is this shallow, so angle of light for this
type of sensor is not the same as for CCD's. CCD junctions (or wells) are
deeper but I don't know the numbers. Kodachrome I believe is shallower
than conventional film and may contribute to sharpness.

The problem with CCD's is that bleeding into adjacent cells causes
color fringing problems. With the Foveon chip, it is not color fringing
but simply pixel smearing that would occur for low angle of light. The
Foveon technology should be just as good with conventional lenses as
film is with respect to angle of light. I think the main problem with the
Foveon approach will be controlling junction depth and color correction.

Wayne


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