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OK, you have reference point. according to the software, your Pyrex mirror without a fan will have roughly the same thermal response as a GSO16 with efficient fan cooling - if you can live with what you have, you can probably live with a bigger commercial quality BK7 mirror.
There are two ways to look at mirrors. the first is to decide that you are going to put in a lot of time and expense making a scope, so skimping on a mirror is false economy. the second is to say that you will be able to afford a larger mirror if you go for lower specs, so you will be able to see more, but with slightly lower image quality than from a perfect mirror of the same size, in the best seeing conditions. How much of a perfectionist are you?
Last edited by Shiraz; 18-07-2012 at 04:30 PM.
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