Re: [APML] Ideal Telescope (was M31 Mosaic project)

["Mike Cook, AF9Y" <mwcook@concentric.net>]

Well, that is a bit heavy.

Given that most of us never have seeing conditions
better than 2.0 arcsecs, it would appear that an
ideal scope would have an 85" focal length with
no more than an F/9 ratio.  With an ST-10, this
would yield 0.65 arcsec/pixel which is oversampled
enough for good deconvolution.  The F/9 would
allow reasonable exposure time for the Lum channel.

With a 0.75 reducer, the same scope would offer a
68" focal length at F/6.75 and 0.87 arcsec/pixel.
That is still significantly oversampled for most seeing
and would provide quick RGB imaging.

Finally a 0.50 reducer with the F/4.5 ratio would be
excellent for imaging with narrowband filters and with
1.3 arcsec/pixel would still be good enough for typical
seeing conditions.

I'm a little surprised that there is nothing available
today that provides the above performance in a
high quality package.

Mike Cook
AF9Y


From:           	Chris1011@aol.com

> prototype. may make some in the future with lighter weight. You would not 
> want this one since it weighs in at 54 lb. 
> 
> Roland Christen
> 



Mike Cook, AF9Y
http://www.af9y.com
mwcook@cris.com




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