Don’t think of 6 - the Unitron Unihex had 6 and it was big and heavy.
I have a TEC turret - 5 x 1.25” with a 2” frontend, and this has some sort of epoxy body to save weight and keep the size down. The eyepiece barrels have to be slim too.
With turrets size and weight are a serious issue - by the time one of these is loaded with a full complement of eyepieces and possibly a camera it could exceed 4 kg and if you rely on a typical crayford it may not hold this load - and worse it may tear the focuser off the scope.
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