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CELESTRON OPTIQUE 9.25" A XLT
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The Celestron C9.25 is an unusual size with its 9.25” aperture and 2350 mm focal length, but many consider it to be the Goldilocks of optical tubes—not too big, not too small. This rugged aluminum optical tube is only 22 inches long and weighs just 20 pounds, making it easy to transport and set up. But the views are much more impressive than what you’d expect from such a compact instrument. The tube offers a focal ratio of f/10 with the added versatility of Fastar (see below).
It is equipped with Celestron’s patented StarBright® XLT optical coatings, which visibly increase contrast and light transmission for brighter deep space images and shorter exposure times. With StarBright XLT, you’ll be able to discern subtle details while viewing the Moon and planets as well as faint galaxies and nebulae.
The Celestron C9.25 can be mounted on a multitude of computerized telescope mounts thanks to its CGEM-style dovetail bar. This iconic optical tube provides the best balance of portability, handling ease, light gathering ability and price ever offered to the amateur astronomer.
In 1997, CCDs were making a name for themselves in the astrophotography world, quickly supplanting traditional film photography thanks to their speed and convenience. This was the year that Celestron joined forces with the Santa Barbara Instruments Group (SBIG) to produce Fastar, a revolutionary add-on to Celestron’s hugely popular Schmidt-Cassegrain (SCT) optical system.
With Fastar, the SCT’s secondary mirror can be removed and replaced with a field-flattening lens assembly (sold separately by third party manufacturers) so that a CCD camera can be used in the front of the telescope at the f/2 focus of the instrument’s primary mirror. The potential of the Fastar system is staggering: exposures are 25 times shorter than if the camera was placed at the instrument’s native f/10 focus. Imagers can capture galaxies and nebulae with exposures of just 30 seconds.
StarBright XLT coatings
StarBright XLT is Celestron’s revolutionary optical coating system. It consistently outperforms all other coatings in the commercial telescope market. There are three major components that make up our StarBright XLT high-transmission optical system design:
|OPTICAL TUBE INFO:|
|Focal Length:||2350mm (93")|
|Focal Length of Eyepiece 1:||25mm (0.98")|
|Magnification of Eyepiece 1:||94x|
|Star Diagonal:||1.25" Star Diagonal|
|Highest Useful Magnification:||555x|
|Lowest Useful Magnification:||34x|
|Limiting Stellar Magnitude:||14.4|
|Resolution (Rayleigh):||0.59 arc seconds|
|Resolution (Dawes):||0.49 arc seconds|
|Light Gathering Power (Compared to human eye):||1127x|
|Secondary Mirror Obstruction:||85mm (3.35")|
|Secondary Mirror Obstruction by Diameter:||36%|
|Secondary Mirror Obstruction by Area:||13%|
|Optical Coatings:||StarBright XLT|
|Optical Tube Length:||559mm (22")|
|Optical Tube Diameter:||271.78mm (10.7")|
|Optical Tube Weight:||20 lbs (9.07 kg)|
|Dovetail:||CGE Dovetail Bar|