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Celestron C9 1/4-A XLT (CG-5) Optical Tube Assembly
Celestron C9 1/4-A XLT (CG-5) Optical Tube Assembly

Celestron C9 1/4-A XLT (CG-5) Optical Tube Assembly

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Your Price: CAD $1,806.28
Retail Price:CAD $1,849.00

Your Savings:CAD $42.72(2%)

Usually ships in 5-7 business days
Part Number:91025-XLT

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Key Technologies

StarBright XLT

 

 

Quick Overview

  • 9.25" Schmidt-Cassegrain Optical Tube Assembly
  • Aluminum Optical Tube
  • Celestron's premium StarBright XLT coatings
  • 2350 mm focal length (f/10)
  • 25 mm eyepiece included (94x)
  • Visual back allows for use with 1.25" accessories
  • 6x30 finderscope to help accurately find objects
  • Star diagonal provides more comfortable viewing position when observing objects that are high in the sky
  • Includes dovetail rail compatible with CG-5 Advanced Series mount

With the C9 1/4-A XLT (CG-5), Celestron allows you to have your own a la carte assemblage of your preferred optical tube and mount.  All Celestron Schmidt-Cassegrain telescopes utilize the multicoated StarBright® coatings group.  Highly reflective coatings are used on the mirrors, with anti-reflective coatings employed on the correcting lens for increases in light transmission.

Celestron's optical systems internal baffling ensures the highest contrast levels.  To maintain the company's mindset as well as to provide consistently high performance and customer satisfaction, all Celestron Schmidt-Cassegrain optical assemblies utilize the same superior optics regardless of their size or configuration.

The StarBright XLT coatings are all that distinguish this offering from the ordinary 9.25" optical tube assembly.  These coatings dramatically decrease the total percentage of light loss incurred by the scope's system of lenses & mirrors by a measure of 43%!  Light is invariably lost as it passes through lenses or is reflected from mirrors, and this can have a particularly dramatic effect of deep space objects.  StarBright XLT coatings are a highly intensive process that diminishes this effect and brings the faintest things your scope can resolve into greater detail.  They'll bring the details of bigger apertures without adding to the weight of your rig.

Limiting stellar magnitude of 14.4
Focus as close as 60' (18 m) for terrestrial viewing
Secondary mirror obstruction of 13.0%(by area)
Aluminum tube materials

Optical Design
Schmidt-Cassegrain
Aperture (mm) 234.95 mm (9.25 in)
Focal Length (mm) 2350 mm (93 in)
Focal Ratio 10
Eyepiece 1 (mm) 25 mm (0.98 in)
Magnification 1 94 x
Finderscope 6x30
Star Diagonal 1.25
Optical Tube Aluminum
Highest Useful Magnification 555 x
Lowest Useful Magnification 34 x
Limiting Stellar Magnitude 14.4
Resolution (Rayleigh) 0.59 arc seconds
Resolution (Dawes) 0.49 arc seconds
Light Gathering Power (Compared to human eye) 1127 x
Secondary Mirror Obstruction 3.35 in (85 mm)
Secondary Mirror Obstruction by Diameter 36 %
Secondary Mirror Obstruction by Area 13 %
Optical Coatings StarBright / XLT
Optical Tube Length 22 in (559 mm)
Optical Tube Weight 20 lbs (9.07 kg)
Dovetail Compatibility CG-5 Mount

 
What's in the Box:
Celestron C9.25-A (XLT) 2350mm f/10 Aluminum OTA w/ XLT (CG-5 Mount Version)
  • 25mm (94x) 1.25" Eyepiece
  • 6x30mm Finderscope
  • 1.25" Star Diagonal and Visual Back
  • Dovetail Slide Bar
  • 2-Year Warranty
  • Based on Astronomy

    Based on Astronomy magazine’s telescope "report cards", scopes of this size and type generally perform as follows . . .


    Terrestrial Observation:No
    Lunar Observation:Very Good
    Planetary Observation:Very Good
    Binary and Star Cluster Observation:Very Good
    Galaxy and Nebula Observation:Very Good
    Photography:Yes
    Terrestrial Photography:No
    Lunar Photography:Yes
    Planetary Photography:Yes
    Star Cluster / Nebula / Galaxy Photography:Yes


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