Quote:
Originally Posted by Steffen
An implementation detail. There are Cassegrain designs with fixed mirrors (like the one I've got, or Peter's MK-65). The ones with moving mirrors can be retro-fitted with Crayford or R&P focusers.
Cheers
Steffen.
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The original quote was a poorly considered blanket statement that is clearly not 100% correct.
It's still a shortfall in the design which can be extremely annoying. I have owned 3 SCT in the past so I know from firsthand experience. Also you need to spend more money than just retro fitted Crayford or R&P focusers because many need mirror locks as well.
Also the fixed mirror systems you mention are not referring to the usual traditional lower cost Meade and Celestron SCT's but generally more expensive heavier, Cassegrains and Maks so again the blanket statement is very misleading.