Quote:
Originally Posted by AG Hybrid
I agree that Hubble Optics is not your run of the mill mass production mirror maker. They have got some really specialized products. Not to mention a production variant sandwich mirror for general sale.
After some reflection I might skip on the big scope and pick up a 12" mirror from these guys and retrofit my current scope some time this year. A rapidly cooling 12" mirror sounds good to me.
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The optical tests I have seen on HO mirrors by Wolfgang Rohr show a tendency to astigmatism and some turned edge . Good value if you get a good one. The 14" I star tested had turned edge. I have never seen any HO mirrors bigger than 14" in this country .
Quote:
Originally Posted by AG Hybrid
Who knows what the quality of their sub-4 mirrors are like? For the price I would settle for diffraction limited. I mean, if the one I get isn't to my liking. I can always send it to you for a re-figure, right? Right?  |
I wouldn't try and refigure a sandwhich mirror - they distort too much while cooling as they are not homogeneous.