Quote:
Telescope side: 2″ barrel with M48 filter thread
Camera side: 2″ female tube accepts camera with 2″ nosepiece.
The 2″ tube can be unscrewed providing a male M48x0.75 thread ( M48-M42 Step down adapter is also included)
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So you can remove the 2" tube to leave a female M48 thread on the telescope side and a male M48 thread on the camera side.
Lets assume without the FR you have a 2" nosepiece that fits into the focuser.
You can now screw the FR onto the end of the nosepiece. Measure from the back flange to the camera to see if you can get the 80-85mm spacing needed. If it is shorter add some extension tubes. If it is longer you would need to replace the nosepeice with a shorter one or use an extension tube in its place with an appropriate stop.
Once you've done this you need to reduce the overall backspacing from the scope to camera by around 40mm.
I achieve this by replacing the 50mm M90 extension with a 25mm one and also remove a total of 15mm of spacers further back in the optical train.
Do you have the measurements of all components from the back of the scope to the camera?