Paul,
Anthony takes things to the nth degree for "high resolution planetary imaging". This thread is discussing the virtues of 2 different telescopes for visual use only. What is needed for high resolution planetary imaging and visual observing are in fact worlds apart. I know a lot of people who use large newtonians for visual planetary observations and
NONE of them have active cooling fitted to their telescopes.
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John you seem to know more about this issue than even Anthony or I
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Paul you aren't remotely qualified to put yourself in Anthony's class. He has been researching active cooling for years and his recent real world achievements speak for themselves. I consider you still have a bit to learn. It is only recently you spent (some would say wasted) a large amount of money on an absolutely superb telescope only to find out after you bought it that it was totally unsuited for the purpose you intended to use it. I could have told you that before you bought it. SDM 14 I believe. An outstanding visual instrument which was never going to be worth a cold frankfurt as an imaging telescope, which was the purpose you bought it for. I believe when you figured out you had made a mistake you subsequently sold it.
http://www.sdmtelescopes.com.au/SDM014.html
Cheers,
John B