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

["Steve Walters" <swalters@att.net>]

Besides, what benefit would it give? You'd have to expose for 3 times as
long since the light is split 3 ways. Plus the prisms would be lossy further
increasing the light level. Better to do 3 shorter exposures sequentially
than one long one.

Steve...

swalters@att.net
http://astrophoto.home.att.net

----- Original Message -----
From: Gene Horr <genehorr@texas.net>
To: <astro-photo@seds.org>
Sent: Wednesday, September 05, 2001 5:43 PM
Subject: Re: [APML] Cygnus mosaic (was Fish on the Platter)


> 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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