Celestron CGEM II 700 180mm f/15 Maksutov-Cassegrain Telescope

Celestron CGEM II 700 180mm f/15 Maksutov-Cassegrain Telescope

Celestron CGEM II 700 180mm f/15 Maksutov-Cassegrain Telescope

B&H # CECGEMII700 MFR # 12016
Celestron CGEM II 700 180mm f/15 Maksutov-Cassegrain Telescope

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Product Highlights

  • 180mm Aperture Maksutov-Cassegrain OTA
  • 2700mm Focal Length, f/15 Focal Ratio
  • StarBright XLT Multi-Coated Optics
  • 28mm Eyepiece, 90° Star Diagonal
  • 2" Visual Back, 1.25" Reducer Adapter
  • CGEM II Motorized GoTo EQ Mount
  • NexStar+ Computer Hand Controller
  • 40,000-Object Database
  • Guided Tours and Custom Object Filters
  • 2" Stainless Steel Tripod
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Mount Options: CGEM II GoTo EQ

CGEM II GoTo EQ CGX GoTo EQ

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Price: $2,699.00

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Celestron CGEM II 700 Overview

  • 1Description

Designed with the discerning amateur astrophotographer in mind, the Celestron CGEM II 700 180mm f/15 Maksutov-Cassegrain Telescope is a powerful astronomical tool that remains manageable and portable. Combining a large-aperture catadioptric optical tube assembly (OTA) with a strong and stable CGEM II mount produces an observational and imaging rig that can reveal stunning details of the moon and planets with the ability to resolve wispy nebula, fuzzy galaxies, and tight binary stars.

The Maksutov design exchanges the conventional front corrector plate of a Schmidt with a convex meniscus lens, resulting in a smaller secondary mirror that limits obstruction and increases contrast, while eliminating the need for periodic collimation. This modified optical path results in a slower focal ratio and narrower field of view versus a similar Schmidt, but the optical benefits, when coupled with the larger aperture and StarBright XLT optical coatings, make it more than capable for long-exposure photography techniques.

The CGEM II GoTo equatorial mount is engineered to carry a 40-pound payload, and with the OTA weighing under 20 pounds there is plenty of payload capacity for all your observation or imaging gear. High-torque dual DC servo motors enable it to smoothly and accurately slew and track all night long. To provide a stable platform for the mount and 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 whole system 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.

This OTA's compact form factor belies its observation power and resolution and is ideally suited as a grab-and-go option for quick observation sessions or heading out to remote locations.

Optical Tube Assembly
  • 180mm (7") diameter aperture enables near- and deep-sky viewing without being prohibitively large or heavy for easy transport to viewing locations
  • Long 2700mm focal length provides a high magnification potential
  • Front convex meniscus lens corrects spherical and chromatic aberrations as well as comas (off-axis aberrations) across the entire field of view
  • Smaller secondary mirror versus Schmidt-Cassegrains reduces obstructions and increases contrast
  • Proprietary StarBright XLT fully multi-coated optical system
  • Resolution: 0.64 arcsec (Rayleigh), 0.52 arcsec (Dawes)
  • Secondary mirror obstruction: 40mm (1.57"), 22% by diameter, 5% by area
  • Internal primary mirror focusing mechanism
  • 2" visual back accepts larger eyepieces and accessories

StarBright XLT Coating System:

  • Multi-layer mirror coatings made from layers of aluminum, SiO2 (silicon dioxide), and TiO2 (titanium dioxide)
  • Reflectivity is flat across the light spectrum, for both astrophotography/astro-imaging
  • Multi-layer anti-reflective coatings made from layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide)
  • High-transmission Water White glass corrector lens with 97.4% light transmission
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:
  • All-Star Polar Alignment system enables the user to choose any bright star in the sky, not just the North (Pole) Star, and the system will calculate and assist in accurate polar alignment for better tracking during long-exposure astrophotography
  • 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
Mount and Tripod
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
  • Runs on included 12 VDC, 3.2A car/vehicle power supply
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
Included Accessories
Eyepiece:
  • Large 2" nosepiece provides a wide field of view for comfortable viewing
  • 28mm focal length delivers a low 96x magnification
  • Threaded to accept most 2" eyepiece filters
Diagonal:
  • 2" nosepiece accepts larger eyepieces, 2" snout allows it to fit into larger focusers without needed adapters
  • 90° angle places the user's head in a comfortable viewing position, especially when the OTA is aimed directly overhead
  • Star configuration corrects view horizontally, but view remains reversed
Reducer Adapter:
  • Inserts into the visual back or diagonal to allow the use of the more common 1.25" eyepieces and accessories
  • Simple drop-in design for fast changes from 2" to 1.25" gear
Finderscope:
  • Low 8x magnification preserves wide field of view to more easily find alignment or guide stars
  • Large 50mm aperture helps to see dimmer objects and stars for more alignment options and finding guide stars for autoguiding during long-exposure astrophotography
  • Includes mounting bracket
UPC: 050234120166
In the Box
Celestron CGEM II 700 180mm f/15 Maksutov-Cassegrain Telescope
  • CGEM II GoTo EQ Mount with Tripod
  • 2" Star Diagonal with Reducer Adapter
  • 2" 28mm Eyepiece
  • 8x50 Finderscope with Bracket
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description

    Celestron CGEM II 700 Specs

    Optical Tube Assembly
    Optical Design Maksutov Cassegrain
    Aperture 180 mm / 7.1"
    Focal Length 2700 mm
    Focal Ratio f/15
    Resolution 0.64 Arcsec (Rayleigh)
    0.52 Arcsec (Dawes)
    Focuser Single-Speed Internal
    Eyepiece Barrel Diameter 1.25", 2"
    Diagonal 90 Star
    Finderscope Yes
    Mounting System Vixen Style, Losmandy Style
    Optical Tube Dimensions 22.5 x 8.8" / 571.5 x 222.3 mm
    Mount
    Type Motorized; German Equatorial
    GoTo Capability Yes, NexStar+
    Payload Capacity 40 lb / 18.1 kg
    Latitude Adjustment 15 to 70
    Counterweight 1 x 17.0 lb / 7.7 kg
    Tripod
    Type Adjustable, 2-Section
    Tripod Height Adjustment Range 53.0 to 65.0" / 134.6 to 165.1 cm
    Material of Tripod Stainless Steel
    General
    Batteries None
    Adapter 12 VDC (Included)
    GPS None
    Wi-Fi None
    Weight 19.0 lb / 8.6 kg (OTA)
    40.0 lb / 18.1 kg (Mount)
    20.0 lb / 9.1 kg (Tripod)
    90.5 lb / 41.0 kg (Fully Assembled)

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