About this product
Part Number: 91027-XLT
Generally accepted as the jewel in Celestron's crown.
"On our first night out, we couldn't resist a peek at an old friend, the Orion Nebula, M42. Using the supplied 24mm eyepiece gave us 98x magnification [now supplied with 25mm / 94x]. The nebula's bright core practically filled the view, bumpy, mottled and full of detail. At it's heart, the main stars of the Trapezium cluster were beautifully split.
To be fair, the central portion of M42 is an easy target. Less the dimming tendrils of glowing gas that arc away from it. They were fascinating to follow and extended for quite some distance. We also liked the view of M42's fainter neighbour, De Mairan's Nebula, M43. It's classic comma shape was easy to see thanks to the contrast delivered by the C9.25's Starbright/XLT-coated optics." Pete Lawrence writing for BBC Sky at Night Magazine
The 9 1/4" was specifically designed for visual infinity focus when using 2" eyepieces and has an optimized baffle system to benefit astrophotography by minimizing vignetting at the edge of the field of view. Its longer primary focal length and lower magnification secondary mirror contribute to a flatter field of view at the focal plane and helps to further reduce optical aberrations.
Latest specification including Fastar/Hyperstar Compatibility.
This C9 1/4 optical system also includes StarBright® XLT coatings.
This version of the OTA is supplied with the wider CGE / Losmandy-style Dovetail (photo shows same telescope fitted with slimmer Vixen-style dovetail) .
- 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
Optical Design: Schmidt-Cassegrain
Aperture: 234.95 mm (9.25 in)
Focal Length: 2350 mm (92.52 in)
Focal Ratio: 10
Optical Tube: Aluminum
Eyepiece 1: 25 mm (0.98 in)
Magnification 1: 94 x
Star Diagonal: 1.25
Optical Coatings: StarBright / XLT
Secondary Mirror Obstruction: 3.35 in (85.09 mm)
Secondary Mirror Obstruction by Area: 13.1 %
Secondary Mirror Obstruction by Diameter: 36.2 %
Optical Tube Length: 22 in (558.8 mm)
Optical Tube Weight: 20 lb (9.07 kg)
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