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I'm using the NGF focuser (the older -CM type I think it is)
The first photo is my standard setup for the Orion ED80 or my Celestron 102. This should work with any refractor with a 2" focuser. The middle adapter will come with the focuser and has a female C thread to screw onto the back of your sct. The right hand adapter is called an SC Adapter and you can order it with the focuser (it comes as a standard accessory with the Meade microfocuser).
Some nights I have to make other arrangements if I'm alreading using the SC adapter. The second photo is of an Orion 2" Prime Focus Adapter ($40 from bintel I think). This unscrews to leave a 2" barrel with a C thread on one end that can be screwed into the focuser adapter instead of the SC adapter or used without the focuser adapter as in the third image.
To swap over from SCT to refractor involves loosening the three grub screws in the focuser that hold the middle adapter in, remove the focuser, screw the SC adapter into the middle focuser adapter, put them back into the focuser, tighten the grub screw again and slide the whole lot into the refractor 2" focuser and tighten the refractor retaining screws. Done!
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