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Celestron 8" NexStar Evolution SCT OTA - Gray - 12091-OTA

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SKU: CEL-12091-OTA

Celestron 8" Evolution SCT OTA with Vixen Dovetail

This Celestron 8” f/10 Schmidt-Cassegrain optical tube assembly offers bright, sharp views with StarBright XLT optical coatings—a great choice for visual observers and budding astroimagers alike. The OTA is silvery-gray with black highlights, and has the Celestron Evolution logo on the mounting rail.

The C8 package includes a StarPointer finderscope, two 1.25” Plossl eyepieces, and a 1.25” star diagonal. The C8 OTA has a Vixen-style dovetail rail for connecting to a wide variety of telescope mounts.

Celestron 8” SCT Specifications


  • Optical Design: Schmidt-Cassegrain
  • Aperture: 203.2 mm
  • Focal Length: 2032 mm
  • Focal Ratio: 10
  • Focal Length of Eyepiece 1: 40 mm
  • Focal Length of Eyepiece 2: 13 mm
  • Magnification of Eyepiece 1: 51x
  • Magnification of Eyepiece 2: 156x
  • Finderscope: Starpointer (Includes 3V CR2032 lithium button battery)
  • Star Diagonal: 1.25"
  • Highest Useful Magnification: 480x
  • Lowest Useful Magnification: 29x
  • Limiting Stellar Magnitude: 14
  • Resolution (Rayleigh): 0.69 arc seconds
  • Resolution (Dawes): 0.57 arc seconds
  • Light Gathering Power: 843x
  • Optical Coatings: StarBright XLT
  • Secondary Mirror Obstruction: 2.5 in (64 mm)
  • Secondary Mirror Obstruction by Diameter: 36%
  • Secondary Mirror Obstruction by Area: 9.77%
  • Optical Tube Length: 17 in