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#93634-A—for Firstscope 80AZ and EQ models. Also fits various older style Celestron refractors and Newtonians. #93633-A—for all Schmidt-Cassegrains. It threads onto the rear cell. #93635-A—for all C90 Spotting Scopes. #94177—required when using the Radial Guider for CCD imaging. #93638—for Nature Zoom Spotters. #93628—for Pro Zoom Spotters. FPO (pick up) #93627—for Wildlife Zoom Spotters. #1836—for Ultima Spotters. T-Rings – 35mm A T-Ring couples your 35mm camera body to a T-Adapter, Radial Guid