FreeLists / opendtv / [opendtv] Re: Red camera lenses

["Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>]

Mark Schubin wrote:

> It is also possible to change the color-separation system. There
> have been three techniques for this: rotating color filters
> (used in the old CBS-color system, the Colorgraphics system, and
> the Apollo mission camera), stacked sensors allowing
> higher-energy colors to pass through the layers intended for
> lower-energy colors (the Foveon sensor used in Sigma cameras),
> and on-chip color filtering -- stripes (Abtography, the
> Panavision Genesis, old inexpensive color video cameras) or on a
> pixel basis (Bayer, diagonal, or the lower-ratio systems used in
> some of Sony's Clear-Vid systems). The color filters are most
> popular: stripes in the Panavision Genesis and Bayer in the ARRI
> D20, the Dalsa Evolution and Origin, the EasyLook Modula HD, the
> NAC Memrecam fx K4, the Red One, the Silicon Optics SI-2K, SI-2K
> Mini, and SI-1920, the Vision Research Phantom HD and Phantom 65,
> the Weinberger Cine Speedcam, the Weisscam HS-1, and many
> smaller-format cameras as well as cameras not intended for TV
> use.

Is color filtering on an individual pixel basis, the last option you
describe, what is used by digital still cameras? I believe it is, and
would seem to be the most compatible way to make use of 35mm/APS lenses
for video.

For a 2 Mpel image, the sensor area would not be stressed at all, and
the lens-to-sensor distance would not need to be extended by a prism or
rotating filter gizmo, to separate the colors.

Bert
 
 
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