Re: [APML] Cygnus mosaic (was Fish on the Platter)

[Gene Horr <genehorr@texas.net>]

cherrio wrote:

> Have you ever heard of anyone doing simultaneous tricolor images? Is it
> possible? Someway?
> Just a thought?!
> With the great minds we have available someone should be able to come up
> with a way to do multiple pick offs into separate CCD through filters from
> the same source.
> Crazy??  Impossible!! Some challenge!!]

Actually it is done all of the time <g>.  Just look at any high end video
camera.  They use a prism and three chips.

But for film this is a whole other ball of wax.  Prism size and backfocus
demands would make it close to impossible for almost every amateur instrument
made (assuming you don't add a focal extender) and the image quality 
would be worse.  After all you have a prism in addition to the filter in
the light path.  Plus IIRC prisms become tougher to work with with 
"faster" light paths.

A workable idea for CCD but IMO too much trouble for film unless you
have a lot of money to throw at the problem.

Gene Horr
genehorr@texas.net

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