Quote:
Originally Posted by Dave47tuc
Houghy's scope is a M500 which moves its main mirror to get focus like a SCT.
Mine is a MK-67 which has a crayford focuser.
Just different models. 
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Thanks Dave i did mix up my scopes. janokiss I forgot his was the newt version, mine is the cassigrain version. My Poo Poo was meant to be factual, my scope does suffer from image movement when focusing, but when its focussed it doesn't move at all, even through zenith!