...old Celestron C90's used 0.935" diameter accessories. You can check this yourself by measuring the opening at the back of the C90 with a ruler. Preferably, you would want to get a 1-1/4" visual back ...
...set of tool. clean sensor is there. You must have a good battery charge for it to work. take off the lens then hold the camera face down and activate the sensor. This did not work for me but this was ...
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