Hi there, I have just purchased a WO GT-81 and the Flat6A FF to go with. I will be using with the ZWO Filter wheel and ZWO 1600 MM Pro camera.
Looking at the manual that comes with the camera it states the following:
SCOPE - FF - M42 to M48 16.5mm Extender - T2 Extender 11mm - M42 to M42 (Male to Male) adapter - EFW - CAMERA
I have found info that states the FF needs to be set to 7.1mm for the GT-81.
I am a bit confused as have found different information to this on the web and not really sure what I should be looking at. Any help would be much appreciated as this is my first telescope (Only used lenses before).
Many thanks,
Tom.