Celestron Nexstar 90mm OTA (SLT)
  • Celestron Nexstar 90mm OTA (SLT)

Celestron 90mm Maksutov Cassegrain

Optical Tube with dovetail only - does not include a star diagonal, eyepiece, finderscope, mount or tripod.

May be supplied in grey (like the SLT version) or red (like SkyProdigy version)

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  • High quality 90mm Maksutov-Cassegrain
  • Good for terrestrial and celestial observing

Optical Design Maksutov-Cassegrain
Aperture (mm) 90 mm (3.54 in)
Focal Length 1250 mm (49 in)
Focal Ratio 14
Magnification of OPTIONAL 25MM Eyepiece 1 50 x
Magnification of OPTIONAL 9MM Eyepiece 2 139 x
Highest Useful Magnification 213 x
Lowest Useful Magnification 13 x
Limiting Stellar Magnitude 12.3
Resolution (Rayleigh) 1.55 arc seconds
Resolution (Dawes) 1.29 arc seconds
Light Gathering Power (Compared to human eye) 165 x
Apparent Field of View 1 °
Linear Field of View (@1000 yds) 53 ft (16 m)
Optical Coatings Fully-Coated
Warranty 2-year Telescope Warranty

Warranty: 2 years 

 PDF Specification sheet for filters and dew straps


Data sheet

Optical Design
Maksutov Cassegrain
4 inch
Mount Type
Single Fork Arm Altazimuth
Focal Length
1325 mm
Focal Ratio
Optical Coatings
Fully Coated
What is more important?
Image resolution over brightness
Telescope to navigate for you?
Yes, I would like a scope to guide me.

Specific References