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

SKU: CEL-12091-OTA

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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
Description
Description

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
Specifications
Specifications
Model Number 12091-OTA
Telescope Series Celestron OTA
Focal Ratio f/10
Optical Design Schmidt-Cassegrain
Telescope Aperture 203.2mm (8")
Telescope Mount Type No Mount - OTA Only
Type of Electronics OTA Only - No Electronics
Focal Length (mm) 2032
Optical Coatings StarBright XLT
Limiting Stellar Magnitude 14
Lowest Useful Magnification 29x
Highest Useful Magnification 480x
Light-Gathering Power Compared to Human Eye 843x
Focuser Style Internal Moving Primary
Focuser Size Internal Focuser with 1.25" Rear Cell Adapter
Focuser Speed Single Speed
Telescope OTA Length (in.) 17
Warranty Celestron 2 Years
What's in the Box?
What's in the Box?
  • Celestron 8" NexStar Evolution SCT OTA with StarBright XLT Coatings
  • Red Dot Finderscope
  • 40 mm Plossl Eyepiece - 1.25"
  • 13 mm Plossl Eyepiece - 1.25"
  • 1.25" Star Diagonal
Files
Files
  • Celestron 8" Evolution Optical Tube Assembly
  • Celestron 8" Evolution Optical Tube Assembly
  • Celestron 8" NexStar Evolution SCT OTA - Gray - 12091-OTA
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