Celestron C90 90mm (3.5") Maksutov-Cassegrain Spotting Scope

Celestron C90 90mm (3.5") Maksutov-Cassegrain Spotting Scope


The Celestron C90 compact Maksutov-Cassegrain spotting scope delivers high resolution views with moderate to high magnification using a combination corrector lens and mirror design. The result is a scope that has over 1.2 meter focal length in a 40cm long housing. Now that's compact!

The C90 is great for use as a spotting scope to watch our fine feathered friends (and other nature), for use as a surveillance device, or as an astronomical telescope to look at planets, the Moon, and deep-sky objects.

Use the C90 as a budget long telephoto lens and capture subjects well beyond the reach of ordinary camera lenses.

The flexible nature of the mounting allows you to mount these to standard camera tripods, altazimuth mounts, or equatorial mounts.


  • Multicoated optics
  • Maksutov-Cassegrain optical design
  • Compact and highly portable
  • Expandable magnification using standard 1.25" diameter eyepieces
  • Erect image system for terrestrial and astronomical use
  • Built-in DSLR/SLR camera T-ring adapter (requires T2 ring sold separately)
  • Mounts to standard camera tripods
  • Nylon backpack


  • Aperture: 90mm (3.5")
  • Focal length: 1250mm (49")
  • Focal ratio: f/13.8
  • 32mm (39x) eyepiece (1.25")
  • 45° erect image diagonal
  • 8x21 erect image finderscope
  • Angular Field of View: 1.3° (with included eyepiece)
  • Linear Field of View: 23m@1000m (68ft@1000yds) (with included eyepiece)
  • Eye relief: 20mm (.78") (with included eyepiece)
  • Close focus: 4.5m (15ft)
  • Camera Capable:
    • USB imagers
    • All-in-one cameras via universal digital camera adapter
    • DSLR/SLR (Requires T2 ring)
    • Above cameras and adapters sold separately
  • Tripod mount: 1/4" 20tpi, compatible with standard camera tripods
  • Tripod: Sold separately
  • Length: 40cm (16")
  • Width: 12cm (4.7")
  • Weight: 2.3kg (5lbs)
  • Color: Black
  • Limited Lifetime Warranty