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Old 18-02-2013, 07:16 PM
clive milne
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clive milne is offline
 
Join Date: May 2011
Location: Freo WA
Posts: 1,443
btw) Just another idea to throw in to the mix:
I got the impression that you were considering the purchase of a new mount (eq8?)
An alternative to that would be a second hand AP1200. There seems to be
a constant trickle of these coming up for sale as their owners upgrade to the
new 3600. You can expect to pay $6500 on up (in the U.S.)
If you made a 16" to 20" newtonian OTA and paid attention to the opto
-mechanical support and thermal management issues, you could end up with
a world class galaxy imaging rig on a relatively modest budget. If your
primary was a 20" F3.8, it would only be marginally bigger than an RC
of similar aperture. You could use the RCC1 at its native focal length.
You could also use the Keller 1.8x corrector to image at F6.8 and have
enough BFD to use AO, off axis guiding + filter wheel for either option.

regards,
~c
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