Astrophotography with an old C90 Maksutov Telescope? - YouTube
Celestron C90 Mak Spotting Scope 52268 B&H Photo Video
Amazon.com : Celestron 52268 C90 Mak Spotting Scope (Black) & Zoom Eyepiece for Telescope - Versatile 8mm-24mm Zoom for Low Power and High Power Viewing - Works with Any Telescope That Accepts
Celestron C90 Maksutov Telescope with Extra Lenses and Kits in Hard Plastic Case | eBay