Celestron Advanced GT Series Telscopes

Celestron Advanced GT Series

Advanced GT Series Details

The Advanced GT series of computerised telescopes from Celestron consists of eight models, ranging in price from the C6-NGT at $799 up to the C11-SGT XLT at $2399. Each model in the GT series is designed with the 'serious amateur' in mind. All models come with a heavy-duty computerised German Equatorial mount with two inch stainless steel legs and a centre tray for extra strength.

All models have a computerised control system plus the Autoguider functionality for astrophotography. A GPS upgrage is available allowing the GT telescope to pinpoint its location on the planet quickly allowing quick alignment of the telescope.

Each telescope comes loaded with a 40,000 plus object database and software.

Advanced GT Model Range

  • C6-SGT - 6 inch Schmidt-Cassegrain
  • C6-NGT - 6 inch Reflector
  • C6-RGT - 6 inch Refractor
  • C8-NGT - 8 inch Reflector
  • C8- SGT XLT - 8 inch Scmidt-Cassegrain
  • C9 1/4-SGT XLT - 9.25 inch Scmidt-Cassegrain
  • C10-NGT - 10 inch Reflector
  • C11-SGT XLT - 11 inch Scmidt-Cassegrain
  • Details
  • Specs
  • Reviews
  • Proven NexStar computer control technology
  • RS-232 communication port on hand control to control the telescope via a personal computer
  • Autoguider port for long exposure astrophotography
  • 40,000+ object database with 400 user-definable objects and expanded information on over 200 objects
  • Double line, 16-character Liquid Crystal Display Hand Control with 19 fiber optic backlit LED buttons
  • DC Servo motors with encoders on both axes
  • The CG-5 GT computerized mount features Celestronís sleek integrated design.
C6-SGT C6-NGT C6-RGT C8-NGT
OPTICAL DESIGN Schmidt-Cassegrain Reflector Refractor Reflector
APERTURE 150 mm (5.91 in) 150 mm (5.91 in) 150 mm (5.91 in) 203.2 mm (8 in)
FOCAL LENGTH 1500 mm (59.06 in) 750 mm (29.53 in) 1200 mm (47.24 in) 1000 mm (39.37 in)
FOCAL RATIO 10 5 8 4.92
EYEPIECE 1 25 mm (0.98 in) 20 mm (0.79 in) 20 mm (0.79 in) 20 mm (0.79 in)
MAGNIFICATION 1 60 x 38 x 60 x 50 x
FINDERSCOPE 6x30 6x30 9x50 9x50
MOUNT CG-5 Equatorial CG-5 Equatorial CG-5 Equatorial CG-5 Equatorial
OPTICAL TUBE Aluminum N/A N/A N/A
HIGHEST USEFUL MAGNIFICATION 354 x 354 x 354 x 480 x
LOWEST USEFUL MAGNIFICATION 21 x 21 x 21 x 29 x
LIMITING STELLAR MAGNITUDE 13.4 13.4 13.4 14
RESOLUTION (RAYLEIGH) 0.93 arcsec 0.93 arcsec 0.93 arcsec 0.69 arcsec
RESOLUTION (DAWES) 0.77 arcsec 0.77 arcsec 0.77 arcsec 0.57 arcsec
LIGHT GATHERING POWER 459 x 459 x 459 x 843 x
ANGULAR FIELD OF VIEW 0.83 ° 1.3 ° 0.83 ° 1 °
LINEAR FIELD OF VIEW (@1000 YDS) 44 ft (13.41 m) 68 ft (20.73 m) 44 ft (13.41 m) 53 ft (16.15 m)
SECONDARY MIRROR OBSTRUCTION 2.2 in (55.88 mm) 1.75 in (44.45 mm) N/A 2.2 in (55.88 mm)
SECONDARY MIRROR OBSTRUCTION BY DIAMETER 37.3 % 29.6 % N/A 27.5 %
SECONDARY MIRROR OBSTRUCTION BY AREA 13.9 % 8.8 % N/A 7.6 %
OPTICAL COATINGS StarBright XLT Aluminum Multi-Coated Aluminum
OPTICAL TUBE LENGTH 16 in (406.4 mm) 27 in (685.8 mm) 50.5 in (1282.7 mm) 37 in (939.8 mm)
TELESCOPE WEIGHT 52 lb (23.59 kg) 54 lb (24.49 kg) 68 lb (30.84 kg) 67 lb (30.39 kg)
COUNTERWEIGHTS 1 - 11lb 1-7lb, 1-4lb 2-11lb 2-11lb
AC ADAPTER Car Battery Adapter N/A N/A N/A
C8-SGT XLT C9 1/4-SGT XLT C10-NGT C11-SGT XLT
OPTICAL DESIGN Schmidt-Cassegrain Schmidt-Cassegrain Reflector Schmidt-Cassegrain
APERTURE 203.2 mm (8 in) 235 mm (9.25 in) 254 mm (10 in) 280 mm (11.02 in)
FOCAL LENGTH 2032 mm (80 in) 2350 mm (92.52 in) 1200 mm (47.24 in) 2800 mm (110.24 in)
FOCAL RATIO 10 10 4.72 10
EYEPIECE 1 25 mm (0.98 in) 25 mm (0.98 in) 20 mm (0.79 in) 40 mm (1.57 in)
MAGNIFICATION 1 81 x 94 x 60 x 70 x
FINDERSCOPE 6x30 6x30 9x50 9x50
STAR DIAGONAL 1.25 1.25 N/A 1.25
MOUNT CG-5 Equatorial CG-5 Equatorial CG-5 Equatorial CG-5 Equatorial
OPTICAL TUBE N/A N/A N/A N/A
FASTAR COMPATIBLE Yes N/A N/A N/A
ACCESSORY TRAY Yes Yes Yes Yes
CD ROM "The Sky®" Level 1 "The Sky®" Level 1 "The Sky®" Level 1 "The Sky®" Level 1
HIGHEST USEFUL MAGNIFICATION 480 x 555 x 600 x 661 x
LOWEST USEFUL MAGNIFICATION 29 x 34 x 36 x 40 x
LIMITING STELLAR MAGNITUDE 14 14.4 14.5 14.7
RESOLUTION (RAYLEIGH) 0.69 arcsec 0.59 arcsec 0.55 arcsec 0.5 arcsec
RESOLUTION (DAWES) 0.57 arcsec 0.49 arcsec 0.46 arcsec 0.41 arcsec
LIGHT GATHERING POWER 843 x 1127 x 1317 x 1600 x
ANGULAR FIELD OF VIEW 0.64 ° 0.55 ° 0.83 ° 0.71 °
LINEAR FIELD OF VIEW (@1000 YDS) 34 ft (10.36 m) 29 ft (8.84 m) 44 ft (13.41 m) 38 ft (11.58 m)
SECONDARY MIRROR OBSTRUCTION 2.7 in (68.58 mm) 3.35 in (85.09 mm) 2.3 in (58.42 mm) 3.75 in (95.25 mm)
SECONDARY MIRROR OBSTRUCTION BY DIAMETER 33.8 % 36.2 % 23 % 34 %
SECONDARY MIRROR OBSTRUCTION BY AREA 11.4 % 13.1 % 5.3 % 11.6 %
OPTICAL COATINGS Starbright Coating/XLT Starbright Coating/XLT Aluminum Starbright Coating/XLT
OPTICAL TUBE LENGTH 17 in (431.8 mm) 22 in (558.8 mm) 45 in (1143 mm) 24 in (609.6 mm)
TELESCOPE WEIGHT 54.5 lb (24.72 kg) 73 lb (33.11 kg) 94 lb (42.64 kg) 91 lb (41.28 kg)
COUNTERWEIGHTS 1-11lb 2-11lb 3-11lb 3-11lb

A thorough review on the, now unavailable, CG5-GT model by CloudyNights - please note link is to a odf document

Reviews at DealTime on the C8-SGT giving it 4 out of 5 stars

Celestron Advanced GT Telescopes for sale on eBay

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Celestron C6-S GT XLT Advanced Series 6
Celestron C6-S GT XLT Advanced Series 6" Schmidt-Cassegrain Telescope #11079XLT
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Celestron C8 S-GT Advanced Computerized Telescope - 11026-XLT
Celestron C8 S-GT Advanced Computerized Telescope - 11026-XLT
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Celestron C6-S GT X Advanced Series 6
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