Celestron CGEM II 925 Schmidt-Cassegrain
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Celestron CGEM II 925 Schmidt-Cassegrain

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Celestron CGEM II 925 Schmidt-Cassegrain Product description

  1. Schmidt-Cassegrain Design: The Celestron CGEM II 925 employs a sophisticated Schmidt-Cassegrain (SCT) optical design, a catadioptric type that merges the benefits of both refractors and reflectors. This innovative construction allows for a very long focal length in a short, compact optical tube, making it incredibly portable for its aperture given it only encompasses mirrors and lenses in its operation.

  2. Superior Optics with StarBright XLT: Equipped with Celestron’s advanced StarBright XLT optical coatings, this telescope delivers outstanding light transmission across the visual spectrum. These multi-layer coatings enhance image brightness, clarity, and contrast significantly, providing vivid views of planetary details and faint deep-sky objects by allowing more light to be captured and reflected.

  3. Versatile 9.25-inch Aperture: The 9.25-inch (235mm) aperture offers an excellent balance between light-gathering power for deep-sky observations and high resolution for detailed planetary and lunar viewing. This versatility makes it ideal for a wide range of astronomical pursuits, from casual stargazing to serious astrophotography, due to its ability to collect a large amount of light.

  4. Robust CGEM II Mount Compatibility: Designed specifically as an optical tube assembly (OTA), the CGEM II 925 is perfectly suited for Equatorial GoTo mounts, particularly Celestron's CGEM II series. This compatibility ensures a stable platform for tracking celestial objects and is crucial for long-exposure astrophotography, providing precision and minimal vibrations.

ABOUT THE Celestron CGEM II 925 Schmidt-Cassegrain

The Celestron CGEM II 925 Schmidt-Cassegrain stands out as a superb choice for both amateur and experienced astronomers seeking a versatile and high-performance instrument. Its 9.25-inch (235mm) aperture is a unique offering in the Schmidt-Cassegrain lineup, providing superior light gathering over 8-inch models while remaining more manageable than larger 11-inch or 14-inch telescopes. This compact catadioptric design uses a combination of mirrors and a corrector plate to fold the light path, resulting in a long focal length (2350mm) within a relatively short optical tube. This makes the CGEM II 925 exceptionally portable for its power. Equipped with StarBright XLT optical coatings, it delivers stunningly bright, sharp, and high-contrast images, revealing intricate details on planets and dim features in deep-sky objects. It is intended for a broad range of uses, from visual observing of nebulae and galaxies to high-resolution lunar and planetary astrophotography, leveraging its robust construction and advanced optical performance.

ABOUT CELESTRON

Celestron, founded in 1960 in Torrance, California, USA, is a world-renowned leader in the astronomical industry. The company is celebrated for its pioneering advancements in telescope technology, most notably their innovative Schmidt-Cassegrain telescopes and industry-leading computerized GoTo mounts. Celestron has built a strong reputation for producing high-quality, reliable, and user-friendly optical instruments that appeal to both beginners and seasoned astronomers. Their commitment to optical excellence and continuous innovation has cemented their position as a trusted name, known for making sophisticated astronomy accessible to a global audience.

MAIN FEATURES

  • Optical Design: Schmidt-Cassegrain Reflector, renowned for its compact design and long focal length, making it highly versatile for both planetary and deep-sky observations.

  • Aperture: 235mm (9.25 inches), providing exceptional light-gathering capability for bright, detailed views of celestial objects.

  • Focal Length: 2350mm.

  • Focal Ratio: f/10, optimizing contrast and detail for high-magnification viewing.

  • Optical Coatings: Features Celestron’s proprietary StarBright XLT coatings for maximum light transmission and enhanced image brightness and sharpness.

  • Tube Material: Sturdy aluminum optical tube assembly (OTA).

  • Dovetail Type: Compatible with both CGE/Losmandy (D-style) and Vixen (V-style) saddles, ensuring broad compatibility with Equatorial GoTo mounts like the CGEM II.

  • Weight (OTA): Approximately 9.5 kg (21 lbs), offering a balance of aperture and portability.

  • Resolution (Rayleigh): 0.58 arc seconds.

  • Limiting Stellar Magnitude: 14.4, allowing visibility of very faint objects.

WARRANTY

This product is covered by a 2-year global warranty that includes defects in materials and manufacturing under normal use.

IN THE BOX

  • Celestron CGEM II 925 Schmidt-Cassegrain Optical Tube Assembly (OTA)

  • 9x50 finderscope

  • 2-inch diagonal with 1.25-inch adapter

  • 23mm Axiom LX eyepiece (1.25-inch)

  • Universal dovetail plate (Vixen/Losmandy compatible)

  • Starry Night Special Edition Software download card

  • Instruction manual

General properties

Manufacturer Celestron
Telescopes series Celestron CGEM
Made in -
In production since -
Warranty 2 years
SKU C823071

Optical properties

Optical design of telescope Schmidt Cassegrain
Lowest (useful) magnification. 37.49 x
Highest (useful) magnification. 611.95 x
Apperent FOV (angular). 0.59 °
Optical tube size - diameter -
Optical tube length 559 mm
Optical tube weight -
Aperture. 259.11 mm
Focal length. 2591.15 mm
Focal ratio. $10.00
Eyepiece 1 - Focal Length 25 mm
Eyepiece 1 . magnification 94x
Eyepiece 2 - Focal Length -
Eyepiece 2 . magnification -
Eyepiece 3 - Focal Length -
Eyepiece 3 . magnification -
Light-gathering power. 1242.65 x
Limitting stellar magnitude. $14.62
Rayleigh Resolution. 0.59 Arc seconds
Dawes Resolution. 0.54 Arc seconds

Reflector properties

Secondary mirror size/diameter. 94.05 mm
Secondary mirror obstruction (by diameter). 93.72 %
Secondary mirror obstruction (by area). 14.33 %

Recording properties

Image capturing Optional
Photo adapter Optional

Mounting properties

Mount type of build Computerized Equatorial
Tripod compliant Yes
Type of tripod Adjustable
Tripod material Stainless steel

Navigation properties

Software for Stellar Navigation NexRemote, NexStar
GoTo Telescope Control Yes
GoTo Telecope Language English, French, German, Spanish
Telescope GoTo control interfaces NexRemote
Telescope Alignment method 1-star, 2-star, All-Star Polar Alignment, Last alignment, Quick align, Solar system
Integrated GPS Optional
Tracking Yes
Track rate Lunar, Sidereal, Solar
Track mode EQ North, EQ South
Telescope Guiding -
Slow motion controller No
Slew Speed Nine Slew Speeds
Com. Port AUX port, USB port
Remote Hand Control Double line

Physical properties

Power Supply Unit Car battery adapter
Lens coatings StarBright XLT
Type of Focuser 1.25"
Eyepiece barrel size 1.25'' / 31.75 mm
Eyepiece angle 90°
Barlow diverging lens Not Included
Level No
Total gear weight. 1798.97 oz (51.00 kg)
Color Black

Special features

Finder - Scope 6x30
Recommended for Intermediate
Suitable for observing Astrophotography, Galaxies, Moon, Planets

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