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Celestron Schmidt-Cassegrain Telescope SC 279/2800 EdgeHD 1100 CGX-L GoTo

Celestron EdgeHD optics: corrected image, sharp to the edge!

EdgeHD is Celestron's optical design designation, the "Aplanatic Schmidt-Cassegrain Telescope." After more than 50 years of success, Celestron is revolutionizing the classic Schmidt-Cassegrain telescope.

EdgeHD (English: "Edge High Definition") telescopes are true astrographs. This optical system delivers sharp, distortion-free images right to the edge of the field of view. Not only is coma corrected off the optical axis, as with other so-called "coma-free" optical designs available on the market, but also curvature of the field.

Many optical systems are propagated as "astrographs". They obtain images of stars with the desired precision, but along a curved image plane. When taking pictures with cameras, the result is a conspicuous field curvature that increases towards the edge of the field and becomes more noticeable the larger the sensor. The stars inflate into small rings ("doughnuts") towards the edge. In addition to coma, Celestron Edge HD telescopes also correct for this curvature of field all the way to the edge. This also significantly improves resolution and cut-off size compared to competing optics with a similar aperture.

Celestron's XLT multi-coating also helps EdgeHD optics achieve a significant increase in performance compared to similar systems on the market.

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receive it in usually 7 to 9 working days

The mechanics and tube of the Edge HD telescopes have been completely revised:

Mirror locks hold the main mirror in any focus position without putting pressure on the optical elements. The image always remains stable on the chip, even with long exposure times.

The ventilation openings behind the main mirror ensure rapid air exchange, so that the optics cool down quickly without equal. Thanks to an air filter system, no dust enters the tube.

The CGX-L mount: The L stands for Large, because the CGX-L is the big brother of Celestron's CGX GoTo mount.

Compared to the CGX, the payload capacity has been increased from 25kg to 34kg. This means that the CGX-L also carries Celestron's larger optics with photographic accessories. The worm gears, which have generous dimensions of 144 millimeters, play a key role, allowing smooth operation even with heavy telescopes, as well as the dovetail clamp, which has been enlarged to 270 millimeters and also holds large telescopes safely.

Despite the higher payload capacity, the CGX-L is an easy-to-carry mount for mobile use. It is supplied with an excellent tripod for this purpose.

However, the CGX-L is also well suited for smaller observatories and remote operations. With the CGX-L you get an extremely versatile mount!

The advantages of the CGX-L at a glance:

Increased payload with excellent payload to deadweight ratio

Additional AUX jacks and autoguider connection on the DEC axis for better cable management

144mm helical gears

270 millimeter long dovetail clamp

Steel tripod with 70 millimeter thick legs

31.5mm diameter counterweight rod for heavy loads

Also read the product description of the little sister CGX. Except for the improvements mentioned above, the CGX-L has the same technical characteristics.

The CGX mount: The new standard for mobile astronomy and astrophotography!

The CGX is a mount that has been newly developed from scratch, which meets high demands with its high load-bearing capacity and yet is designed for mobile use.

New product design:

The saddle plate is closest to the axis of right ascension. The reduced lever thus guarantees greater rigidity and better behavior in the face of vibrations. The declination motor also serves as a counterweight.

The CGX is very easy to transport thanks to the integrated handles. The tripod can also be easily folded without having to unscrew the tray. The tripod leg clamps are attached on the inside so you can't get caught in the screw handles with your pant leg. Thanks to the notches on the tripod legs, you can quickly find your preferred extension length for the legs. The new improved tripod also features a longer support distance, making it even more stable.

The motors are wired inside the bracket. Only the manual control box and the power cable are exposed. The connections of these two cables are attached in such a way that the sockets do not move with the bracket. All in all, this design ensures there is no tripping hazard or a cable could break. An automatic stop prevents internal cables from breaking.

Large handles for two-axis calipers, for azimuth adjustment and for polar axis. The tilt of the polar axis can be changed even under load. There is no need to open any clamps, which would change the setting when tightened. Thanks to a Teflon bearing, azimuth adjustment under load is also no problem.

The saddle mount is also equipped with large, glove-compatible handles. The saddle accepts standard Losmandy and Vixen dovetail bars.

The CGX can track objects up to 20° beyond the meridian. An automatic stop prevents the mount from turning completely: it is not possible to collide with the tripod or internally break the cable.

Outstanding Mechanics:

Improved high-torque motors ensure clean starting and tracking even under heavy loads.

The toothed belt drive ensures a short response time and minimizes gear backlash ("backlash") that is noticeable when changing the direction of rotation. The mount starts up quietly, without the painful grinding of pure gears.

A spring pressure mechanism ensures that the worm wheel and worm shaft are pressed evenly. This reduces friction and optimizes transmission operation.

Improved electronics:

Optical encoders record the position of the mount. This way the mount always finds its way back to its starting position and the motors can also stop before the mount reaches its mechanical spin limit.

The new control software is a joint development of Celestron and Planewave Instruments. This ensures very accurate GoTo and other advantages, especially in remote operation.

The CGX is equipped with the latest NexStar+ hand control. This has a USB port for easy connection to PC. An internal clock saves the last observation location and time.

Additional accessories can be connected to two AUX ports, such as the SkyPortal module. Of course, there is also an autoguider port.

With All-Star Polar Alignment built into the controller, you don't need a polar finder. You can easily align the mount roughly and adjust it by adjusting any star. The excellent mechanical design allows this even at full load. Initializing the Goto, the "Star Alignment", is a doddle with all of Celestron's new mounts.

With the CGX mount, Celestron has launched a very mature product that reflects the superior product design of this manufacturer.

PlaneWave Instruments control software for Celestron CGX and CGX-L mounts:

PWI telescope control unlocks the full precision of mounts. With a USB connection from the mount to your PC, the Sky Viewer display makes it easy to find targets. Or you can search for your destinations in the extensive property database. Additionally, PWI has a connection to the SIMBAD online astronomical database for even more objects.

PWI uses PointXP mount modeling, which allows for numerous reference stars to achieve the highest possible accuracy. PointXP (also used in the StarSense AutoAlign module) offers better accuracy than a classic manual control box. By using numerous reference stars, PWI can account for various alignment errors, including device drift. As a result, Goto's accuracy increases again.

PWI Software Feature:

PointXP Mount Modeling accepts as many reference stars as desired.

Developed by Celestron in conjunction with PlaneWave Instruments

Future updates will include more features and improvements.

Sky viewer star map to find objects easily

Extensive property database, including an online database

The software runs on Windows 7, 8 and 10.


Sistema óptico

Tipo  Reflector
Tipo de construcción  EdgeHD-Cassegrain 
Apertura (mm)  279
Distancia focal (mm)  2800
Relación de apertura (f/)  10
Capacidad de resolución  0,41
valor límite (mag)  14
Capacidad colectora de luz  1590
Ampliación útil máxima  558
Bonificación Starbright XLT 
Material de tubo  Aluminio
Longitud de tubo (mm)  610
Peso del tubo (kg) 13
Construcción de tubo Tubo completo


Obstrucción de espejo secundario  12
Diámetro de espejo secundario (mm) 95
Ventilación del espejo primario 

Tubo telescópico del ocular

Reducción ninguno
Conexión (lado de ocular)  2
Rosca de conexión (en el telescopio) SC
Tipo de construcción  Rosca SC


Peso (kg) 21,3
Tipo de construcción  CGX-L
Tipo de montura  ecuatorial 
Capacidad de carga (kg) 34
Ajuste de altura de polo (°) 3 - 65
Fuente de alimentación 12
Diámetro de la barra contrapeso (mm) 31,5
Caballete de montura Losmandy & Vixen


GPS  opcional
Software NexStar
Interfaces 2x Aux, USB 2.0, Autoguider
Base de datos 40.000
Velocidades de seguimiento sideral, solar y lunar
Idioma del sistema GoTo alemán, inglés, francés, español, italiano
Remote Celestron PWI 


Diámetro de las patas del trípode (mm) 70
Tipo Trípode
Material Acero
Peso (kg) 21
Placa para accesorios
Altura máxima de trípode (cm) 134
Altura mínima de trípode (cm) 91

Accesorios incluidos

Placa cola de milano Losmandy-Style
Contrapesos (kg) 2x 10
Sistema óptico de desviación  Espejo zenital 2" - 90o
Adaptador de ocular 1,25" - 2"
Telescopio visor  9x50
Oculares de 2" 16mm

En general

Serie CGX-L 
Peso total (kg) 75,3


Astrofotografía sí (sobresaliente)
Luna y planetas sí (sobresaliente)
Observación de la naturaleza no
Nebulosas y galaxias
Sol  no (solamente con filtro solar apropiado)

Recomendado para

Principantes  no
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