Good OTA. The 90EQ is one of the refractors in the AstroMaster series. As a refractor, it has closed optics, collimation is rarely needed (if at all), and it has good contrast. With a slow focal ratio of f/11, it will make a great lunar and planetary telescope for beginners on a budget looking for a refractor. I have the previous C-90 (1000mm and have taken some digital pictures directly (no prism) through a 30mm celestron ultra eyepiece. Very sharp and no CA. If you can tolerate an inverted image, avoid using the erecting prism. It makes a difference. Photograph lore alludes that composition on view cameras was better because it was upside down. celestron c90 mak. 102mm maksutov. spotting scope 100x. hd spotting scope. maksutov telescope. 17.75 x 11.25 x 10.25 inches: eyepiece, 45° erect image diagonal 8x21 mm erect image finderscope, objective cover, cleaning cloth, and instruction manual all included. Read more. 52268 : 52291 : 52238 : 52305 : Magnification : Celestron Maksutov Telescope Model C90 1000mm f/11 With Accessories and Case. Includes everything pictured in really good condition for to age. Was always stored in the case and lenses always had the cover they are clean and in great condition. > Free safe Celestron PowerSeeker 80EQ Telescope Manual German Equatorial Telescope. AU $244.92 Celestron C90 Scope (1000mm f/11 Mirror Lens) Celestron 5x24 Finder Scope Celestron Star Diagonal .96" Celestron 25mm Kellner Eye Piece .96" Celestron T-Adaptor C90 Celestron Porro Prism .96" Orion Variable Polarizer .965" C90 Scope Carrying Case (Scope and above accessories: $200) Cam Gear Fluid Head Tripod ($50) 25% Off: Celestron 90 Degree Angle Star Diagonal, 1.25" MFR: 94115-A. Buy now & save $17. Accessory Type: Diagonals Went on the Celestron web site and found the manual. An eyepiece fits directly into the eyepiece adaptor and focusing tube. Paul S Will this fit the Celestron C90 1000mm f/11 telescope? If you are someone looking for a versatile spotting scope that can be used in all manner of ways, then the C90 Mak should definitely be on your radar. Type: Maksutov-Cassegrain. Aperture: 90mm. Field of view: 1.3°. Field of View (feet @ 1000yds): 67'. Close focus distance: 15'. Lens coatings: Multi-coated.