Do you have a 2" GSO SCT diagonal (standard, dielectric or quartz) that you want to use with a refractor but cannot? Here is the solution you need! You can simply unscrew the SCT adapter on the telescope end of your GSO SCT diagonal. Then insert this barrel in its place and you can now use your SCT diagonal in 2" refractor focusers.
This adapter has a standard SCT male thread (2", 24 TPI) to connect to the GSO diagonal body on one side. The other (telescope) side has a standard 48mm (M48 x 0.75) female thread so it can accept 2" astronomy filters. The barrel is made of aluminum and the inside is threaded and painted flat black to minimize internal reflections.
This adapter will work with the following diagonals:
- All 2" GSO diagonals
- Some 2" diagonals made by GSO for Celestron, Antares, Burgess, SmartAstronomy, TS (Germany), OPT, and others
This adapter will not work directly with the following diagonals:
- All William Optics diagonals
- Many other Meade, Celestron, Antares and other diagonals
There is no standardization in the astronomy industry for the threads used on diagonal bodies. Hence, do not assume that this adapter will work with your diagonal. Please check the thread on your diagonal body before ordering this item - we do not have compatibility information for all the diagonals out there.