RE: [APML] Newton-cassegrains: opinions sought

["Gene Horr" <genehorr@houston.rr.com>]

-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Emmanuele Sordini

> Anybody have experience with such instruments, especially as compared to
> equally-sized SCTs? I feel that they might be better overall, but with
some
> drawbacks (less compact, more sensitive to local turbulence, and a hassle
> to collimate, especially when switching configuration). Furthermore, they
> don't seem to be very popular among amateur astronomers.

You'll notice a definite improvement over standard SCTs.  However there
will still be some mirror flop which will very likely affect the
Cassegrain images.  You'll have to figure in an off axis guider for
film imaging.

I've seen some great 8x10 prints from 35mm taken with the CN-212,
but I have only used it personally for visual work.

The instrument seems to hold collimation well when changing secondaries.
Adjustments would be a minor tweak.

Gene Horr
genehorr@texas.net



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