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I agree with Paul. A 2.7 inch focuser seems inadequate and certainly will not work with full frame or larger sensors.
Often its best on any RC to ditch the focuser and get a fixed length adapter made up by Precise Parts and install an electronic focuser of some sort or maybe a Moonlite or Feathertouch focuser (3.5 inch models).
The AP focuser on my Honders is a work of art but focus is way too critical to easily achieve manually so I have a fixed length adapter and a FLI Atlas focuser (expensive though). But you wouldn't have to go to that expense to get a good result.
I thought step 1 with GSO RCs was to bin the focuser.
Greg.
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