Celestron CGEM II 1100 280mm f/10 Schmidt-Cassegrain GoTo Telescope

Celestron CGEM II 1100 280mm f/10 Schmidt-Cassegrain GoTo Telescope

Celestron CGEM II 1100 280mm f/10 Schmidt-Cassegrain GoTo Telescope

B&H # CECGEMIISCT MFR # 12012
Special Order
Expected availability: 7-14 business days

Includes Free

Value: $35.00

Product Highlights

  • 280mm Schmidt-Cassegrain OTA
  • 2800mm Focal Length, f/10 Focal Ratio
  • CGEM II Motorized Equatorial Mount
  • NexStar+ Computer Controller
  • Database of 40,000+ Objects
  • Multiple Assisted Alignment Procedures
  • Guided Tours and Custom Object Filters
  • Backlash Compensation and PPEC
  • 1.25" 25mm Eyepiece and 90° Diagonal
  • 2" Adjustable Stainless Steel Tripod
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Price: $3,549.00

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Celestron CGEM II 1100 overview

  • 1Description

With the largest aperture and longest effective focal length in the series, but maintaining the relatively short physical length Schmidt-Cassegrain telescopes (SCTs) are known for, and combined with a sturdy and precise mount, the Celestron CGEM II 1100 279mm f/10 Schmidt-Cassegrain GoTo Telescope is an ideal rig for both celestial observation and astrophotography. It comes with the SCT optical tube, a solid motorized equatorial mount, the venerable NexStar+ computer hand controller, an eyepiece, and a 90° star diagonal. Whether you're conducting planetary or deep-space viewing or imaging, the CGEM II 1100 provides the performance and portability you need.

  • C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGE Dovetail)

    Outfitted with an over-sized aperture, long effective focal length, and their proprietary StarBright XLT optical coatings, the Celestron C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope provides power and portability. The coating system consists of anti-reflection coatings on the corrector plate, highly reflective index mirror coatings, and low-absorption/high-transmission glass components to ensure that the maximum amount of light is gathered and transmitted to the user's eye. This system ensures bright and clear high-contrast images with accurate color rendition across the entire visual spectrum without visible distortion at the edges. Celestron includes a standard 1.25" visual back to accept eyepieces and accessories such as the 40mm eyepiece and 90° diagonal supplied with the optical tube assembly (OTA). This OTA is offered here without a mount or tripod for users who already have a support system—just ensure the mount's payload capacity exceeds 27.5 pounds to safely carry the weight and that the mount has a Losmandy-style saddle to match the OTA's CGE mounting plate.

    Optical Tube
    • 11" (279.4mm) aperture
    • f/10 focal ratio
    • 2800mm effective focal length
    • Schmidt-Cassegrain design optical path
    • StarBright XLT optical coatings
    • Resolution: 0.5 arcsec (Rayleigh); 0.42 arcsec (Dawes)
    • Secondary mirror obstruction: 3.75" (95 mm); 34% by diameter; 12% by area
    StarBright XLT System
    • Maximizes light transmission through optical path
    • Improves color rendition, contrast, sharpness, resolution, and brightness
    • Broadband system provides flat wavelength transmission across the entire visual spectrum
    • Multi-layer mirror coatings with layers of aluminum, SiO2 (quartz), and TiO2 (titanium dioxide)
    • Multi-layer anti-reflective corrector plate coatings with layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide); hafnium has a wider band-pass than the commonly used titanium
    • High-transmission water white glass corrector plate limits light loss due to internal absorption
    Mounting
    • Optical tube only—mount and tripod required for proper use
    • Supplied with CGE dovetail plate, which is compatible with Losmandy-style saddles
    • Mount must have a payload capacity of over 27.5 pounds to safely support the OTA
    Included Accessories
    • Visual back:
    • Standard threads for Schmidt-Cassegrain telescope optical tubes
    • 1.25" holder accepts 1.25" eyepieces and accessories
    • Eyepiece:
    • 1.25"-diameter barrel
    • Accepts most 1.25" astronomical filters
    • 40mm focal length produces 70x magnification
    • Diagonal:
    • 1.25"-diameter barrel
    • 90° angle places head in comfortable viewing position when scope is aimed at or near the zenith
    • Star diagonal corrects view horizontally, but not vertically
    • Finderscope:
    • 9x magnification
    • 50mm aperture
    • Mounting bracket included
    UPC: 050234103695
  • CGEM II GoTo EQ Mount with Tripod

    Celestron updates their venerable and versatile mid-level mount with the CGEM II GoTo EQ Mount. Engineered to carry a 40-pound payload and high-torque dual DC servo motors, it is able to smoothly and accurately slew and track heavier optical tube assemblies (OTAs) and rigs up to an 11" Schmidt-Cassegrain. Its Vixen/Losmandy dual dovetail saddle makes the mount compatible with most plates used today. Celestron also improves its usage by adding compatibility with their SkySync GPS unit for a higher level of precision during setup and alignment. To provide a stable platform for the mount and your OTA, a heavy-duty stainless steel tripod is included that sports large 2" legs and an accessory tray that doubles as a stabilizer.

    The brain of the CGEM II is the NexStar+ computer controller. Equipped with a database of 40,000 objects, including the planets, stars, nebulae, galaxies, and the complete Messier catalog, it can also be programmed with up 100 custom user-defined objects with filters added for custom object lists. Its intuitive menu-driven user interface provides the power to observe the heavens with nine slew speeds and three tracking rates, plus anti-backlash compensation and Permanent Periodic Error Correction (PPEC) for smoother movements in the motors and improved tracking over time. Features such as guided tours, extended information on 200 popular objects, and multiple alignment options make the NexStar+ controller easy to use and invaluable to new users and experienced stargazers.

    Mount
    • German equatorial mount
    • 40-pound payload capacity
    • 15-70° latitude adjustment range
    • Dual-axis low-cog DC servo motors with optical encoders for smooth tracking and quiet operation
    • High-torque motors provide smooth tracking and slewing for heavy OTAs
    • Autoguider port for making corrections while astroimaging
    • Dual Vixen/Losmandy dovetail saddle, compatible with CG-5 and CGE bars
    • Long clutch levers make tightening and loosening of clutches easier for manual movement
    • Internal cables/wires for snag-free operation
    • GPS-compatible with optional SkySync unit
    • Runs on included 12 VDC, 3.2A car/vehicle power supply
    NexStar+ Hand Controller
    • Features:
    • Intuitive menu-driven user interface
    • Nine Slew Speeds: 2x, 4x, 8x, 16x, 32x, 0.3°/sec, 1.0°/sec, 2°/sec, 4°/sec
    • Multiple Tracking Rates: Sidereal, Lunar, and Solar
    • Anti-Backlash Correction: Trains out intrinsic play in gears for smoother movement and tracking
    • Permanent Periodic Error Correction (PPEC): Improves tracking precision for long-exposure astrophotography and imaging
    • Database:
    • 40,000-object database
    • 100 user-defined objects for customization
    • Filters for creating custom object lists
    • Solar system: All seven planets plus the Moon, Sun, and Pluto
    • Custom lists of all the brightest stars, double stars, variable stars, and asterisms
    • Custom lists of all the best galaxies, nebulae, and clusters as well as the complete Messier catalog and select NGC objects
    • Functions
    • Alignment options: One- or Two-star, Solar system, Quick, and Last
    • Sky Tour: Based on location, date, and time, the system shows the best objects in the sky and automatically slews to them
    • Object Info: Provides useful information about the selected object such as magnitude and constellation; includes extended information about 200 popular objects
    • Physical characteristics:
    • 2-line, 16-character LCD window with red backlighting for comfortable viewing without affecting night-adjusted vision
    • 19 function keys, backlit in red
    • Micro-USB port: Connect to a computer, for use with software programs for point-and-click slewing capability and updating firmware via PC
    Tripod
    • Stainless steel legs
    • Heavy-duty 2" diameter
    • Graduated markings on lower section for height repeatability
    • Accessory/eyepiece holder tray that doubles as leg spreader/lock
    • Weight: 20 pounds
    UPC: 050234915236
In the Box
Bundle Items
  • 40mm Eyepiece
  • 1.25" 90° Diagonal
  • SCT Visual Back
  • 9x50mm Finderscope
  • Universal Mounting Plate, CGE
  • Limited 2-Year Warranty
  • NexStar+ AZ Hand Controller
  • 17 lb Counterweight for the CGEM EQ Mount
  • Stainless Steel Tripod
  • Counterweight Shaft
  • NexRemote Software DVD
  • 12VDC Car/Vehicle Power Adapter
  • Limited Two-Year Warranty
Table of Contents
  • 1Description
  • C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGE Dovetail)
    Optical Design Schmidt-Cassegrain
    Aperture 279mm
    Focal Length 2800mm
    Focal Ratio f/10
    Eyepiece Barrel Diameter 1.25"
    Diagonal 90° star
    1.25" barrel
    Finderscope 9x50 mm
    Tripod None
    Mount Type CGE dovetail plate
    Power Source None
    Optical Tube Length 24.0" / 61.0 cm
    Weight 27.5 lbs / 12.5 kg
    Packaging Info
    Box Dimensions (LxWxH) 30.0 x 18.0 x 17.0"
  • CGEM II GoTo EQ Mount with Tripod
    Mount Type Equatorial
    Load Capacity 40.0 lb / 18.1 kg
    Motor Dual-axis low-cog DC servo
    GO-TO Capability Yes, NexStar+ hand controller
    Latitude Adjustment Range 15 - 70°
    Polar Axis Scope None
    Includes Tripod/Pier Adjustable-height stainless steel
    2"-diameter legs
    Power Source 12 VDC, 3.2 amps
    Weight Mount: 40.0 lb / 18.1 kg
    Tripod: 20.0 lb / 9.1 kg
    Total: 77.0 lb / 34.9 kg
    Packaging Info
    Box Dimensions (LxWxH) 42.5 x 19.8 x 13.1"

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