Quote:
Originally Posted by rogerg
Mike,
I’ve been thinking about your Orion AG. It produces such nice results in part due to the matching of your focal length to chip size. I have been considering what OTA to replace my 12” SCT with. Current top contender is the 16” GSO RC when it comes out if it’s up to scratch. But your Orion has me thinking.
What’s the disadvantage to a fast focal ratio like your AG? Or is there a disadvantage to the position of the camera? Or is the only disadvantage cost and the telescope is otherwise perfect?
My thought goes like this: Not being on top of a Chilean mountain my FWHM is never going to get better than my usual 4”-6”. Pixel scale less than 1” is wasted on me, usually less than 1.5” is wasted on me. Hence, focal lengths > ~2000mm are wasted on me, but aperture I want. One can overcome this by binning 2x2 permanently or by decreasing the focal length. The Orion AG being the latter option.
Any comments based on your experience?
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All depends on what you have in mind, I wanted speed, aperture, semsitivity, versatility and portability (greedy huh
). In my mind 1200mm FL provides the best compromise with a large chip and 9micron pixels to cover all bases quite well and the speeeeeed is a god send
I've sent you an email
Mike