Quote:
Originally Posted by TheFacelessMen
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.
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No design is perfect, otherwise everyone would use the same superior type of scope and we wouldn't be having this debate...
Mass market scopes are now starting to include some of these features in the design - Celestron's Edge HD scopes have mirror locks and the newer Meades have built in zero shift focus. They're not inexpensive...here...but the Edge HD stuff is becoming fairly popular in the US with good reviews and promotional pricing. It's just they're expensive here
But it's not like additional rear mounted focusers don't exist.