Celestron C6-A XLT OTA
  • Celestron C6-A XLT OTA

Celestron C6-A XLT

Celestron Schmidt-Cassegrain Optical Tube Assemblies (OTA) are available individually for use with your favorite mount. Each OTA is made to the same exacting standards as those used on all our high quality telescopes.

£649.00
VAT included
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Delivery In 1-5 Days*

 

In-stock products are delivered in 1-5 Days*

 

21 Days Returns

Warranty: 2 years
 All optical surfaces are coated with Celestron’s high efficiency StarBright® multi-layered coating group. These tube assemblies are equipped with the same dovetail mounting bar used on the CGE and Advanced Series for easy attachment to a variety of popular mounts.

GENERAL FEATURES: 

  • 6" Schmidt-Cassegrain Optical Tube Assembly

  • Aluminum Optical Tube

  • Celestron's premium StarBright XLT coatings

  • 1500 mm focal length (f/10)

  • 25 mm eyepiece included (60x)

  • Visual back allows for use with 1.25" accessories

  • 6x30 finderscope to help accurately find objects

  • Star diagonal provides more comfortable viewing position when observing objects that are high in the sky

  • Includes dovetail rail compatible with CG-5 Advanced Series mount

SPECIFICATIONS:
OPTICAL DESIGN  : Schmidt-Cassegrain 
APERTURE  : 150 mm (5.91 in) 
FOCAL LENGTH  : 1500 mm (59.06 in) 
FOCAL RATIO  : 10 
EYEPIECE 1  : 25 mm (0.98 in) 
MAGNIFICATION 1  : 60 x 
FINDERSCOPE  : 6x30 
STAR DIAGONAL  : 1.25 
OPTICAL TUBE : Aluminum black 
FASTAR COMPATIBLE  : No 
HIGHEST USEFUL MAGNIFICATION : 354 x 
LOWEST USEFUL MAGNIFICATION  : 21 x 
LIMITING STELLAR MAGNITUDE : 13.4 
RESOULTION (RAYLEIGH) : 0.93 arcsec 
RESOLUTION (DAWEWS) : 0.77 arcsec 
LIGHT GATHERING POWER : 459 x 
ANGULAR FIELD OF VIEW : 0.83 ° 
LINEAR FIELD OF VIEW (@1000 yds)  : 44 ft (13.41 m) 
SECONDARY MIRROR OBSTRUCTION: 2.2 in (55.88 mm) 
SECONDARY MIRROR OBSTRUCTION BY DIAMETER : 37.3 % 
SECONDARY MIRROR OBSTRUCTION BY AREA : 13.9 % 
OPTICAL COATINGS : StarBright XLT 
OPTICAL TUBE LENGTH: 16 in (406.4 mm) 
OPTICAL TUBE WEIGHT: 10 lb (4.54 kg) 
DOVETAIL COMPATIBILITY : CG-5 Mount 

Our view

It is difficult to recommend a better optical tube assembly for general astronomy than the C6 SCT. Since its introduction, the 6" SCT has become the star of the SE series of telescopes, and as a stand-alone tube assembly, its extremely compact and lightweight structure, makes it the ideal carry anywhere telescope. Other tube assemblies that have larger apertures are bulkier and heavier. Even other 6" tube assemblies cannot compete for weight. The 5" SCT tube assembly (available as the C5 spotting scope), is smaller and lighter but its astronomical performance is not to the same standard. The C6 is superior for deep-sky, planetary detail and has a higher resolving power than the C5. It can be used on most astronomical mounts and even on a very sturdy heavy duty camera tripod as a powerful spotting scope. Photographically it is an excellent diffraction limited 1500mm f/10 telephoto, or with the addition of the Celestron f/6.3 reducer lens, becomes a 945mm f/6.3 telephoto. Close focus is around 7m so photographing close wildlife is possible. For a closer look at the SCT design generally, please refer to our Schmidt Cassegrain section in our Astro Guide. 

The C6 has much better light gathering ability and resolving power than any similar priced apochromatic refractor, is lighter in weight and more compact than any similar aperture Newtonian, and is lighter in weight and faster to reach thermal equilibrium than similar aperture Maksutov Cassegrains. Celestron's XLT coatings on the Schmidt Plate and both mirrors make an enormous difference to image brightness and contrast for deep-sky images, and its 1500mm focal length is very useful for achieving the image scale required for planetary video imaging.

With any Cassegrain telescope you will have to consider the affect dew fall. The cheapest solution is a lens hood but when dew is a real problem then heater straps will evaporate dew off.

 PDF Specification sheet for filters and dew straps

91010

Data sheet

Optical Design
Schmidt Cassegrain
Aperture
6 inch
Focal Length
1500 mm
Focal Ratio
F10
Optical Coatings
Starbright XLT Coating
Optical Tube Length (mm)
16 inch

Specific References

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