Celestron Schmidt-Cassegrain telescope SC 279/2800 C11 OTA

Celestron C11 OTA

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Celestron Schmidt-Cassegrain telescope SC 279/2800 C11 OTA

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According to the supplier's stock, usually deliver within 2 to 4 business days

2'660.0 CHF tax incl.

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Celestron Schmidt-Cassegrain telescope SC 279/2800 C11 OTA

Manufacturer's product description:

Celestron SC telescopes:

Despite the long focal length of these telescopes, the OTA itself has a very short length, making the system a compact telescope which is extremely easy to transport. Light first hits an aspherically figured Schmidt corrector plate and is then thrown onto a spherical main mirror. This reflects the light back up, throwing it onto a secondary mirror which subsequently throws it back in the direction of main mirror. The light then passes through a central hole in the main mirror and into the focuser at the bottom of the OTA. Thus the system is closed and hence does not suffer from air turbulence which could degrade the image. Of course this also means that the system is optimally protected from dust. The Schmidt plate is multi-coated, ensuring bright images which do not suffer from stray light reflections.

This telescope provides a very good image, boasting high contrast and definition and provides a lot of pleasure when planetary observing. The Schmidt-Cassegrain design provides a good all-round system suitable for both observing and astrophotography and with an enormous range of optional accessories available. Using the bottom end of the OTA to look through means easy orientation. The system is also optimal for occasional terrestrial observing, e.g. birdwatching at close range. Celestron SC telescopes have an aperture ratio of around 1:10 which, so astrophotography is also very easily possible.

Main mirror focusing means a very large range of focus is made available, which allows virtually any common accessory to be used. Two pre-loaded ball bearings are used in the main mirror focus positioning mechanism in order to prevent 'mirror shift' - a typical problem when using simple bushings. The use of high quality materials such as CNC-milled aluminium components, cast steel and stainless steel guarantees extreme robustness with low weight. This means that a very heavy mount is unnecessary, not always the case for other telescope designs.

Features of these telescopes:

  • long focal length with short OTA
  • low weight aluminium OTA
  • high quality XLT multi-coating
  • closed system
  • pre-loaded ball bearings for low mirror shift main mirror focusing

Included in delivery with the telescope:

  • OTA with 279mm aperture and 2800mm focal length
  • 40mm Ploessl eyepiece
  • 1.25" star diagonal
  • mounting rail
  • 8x50, straight view finder scope



Type glossary_info.png Reflector
Type of build glossary_info.png Schmidt-Cassegrain
Aperture (mm) glossary_info.png 279
Focal length (mm) glossary_info.png 2800
Aperture ratio (f/) glossary_info.png 10
Resolving capacity glossary_info.png 0,41
Limit value (mag) glossary_info.png 14
Light gathering capacity glossary_info.png 1590
Max. useful magnification glossary_info.png 560
Tube length (mm) 610
Coating Starbright XLT
Tube construction Full tube


Secondary mirror obstruction 34
Secondary mirror diameter (mm) 95,3


Type of build glossary_info.png SC thread
Connection ( to eyepiece) glossary_info.png 2


Mounting type no mount
GoTo control no
Type of build glossary_info.png OTA
Tracking glossary_info.png no

Included accessories

1.25'' eyepieces PL 40mm
Finder scope 9x50
Deviating optics 1.25", 90° star diagonal
Miscellaneous 3"mounting rail (Losmandy)


Total weight (kg) 12,2
Series OTA
Special recommendation yes

Area of application

Moon & Planets yes
Nebulae & galaxies yes
Nature Observation yes
Astrophotography yes
Sun not recommended (Only with appropriate Sun filter)

recommended for

Beginners no
Advanced yes
Observatories no