The Celestron C6-A Optical Tube Assembly (OTA) serves as a versatile piece of equipment, boasting a focal length of 1500 mm and an f/10 focal ratio. It trumps 5-inch Cassegrains by gathering 40% more light, making it an excellent choice for stargazers. The tube also incorporates Celestron's signature StarBright® XLT optical coatings, enhancing both contrast and light transmission. This means you'll capture more detailed images of celestial objects in less time.

As for mounting options, this OTA comes with a CG-5 dovetail bar, which allows it to be easily attached to a variety of computerized telescope mounts. Of course, it's equally compatible with basic manual altazimuth mounts for traditional night sky observation or daytime terrestrial viewing.

What sets the Celestron C6-A apart is its well-rounded nature; it offers a unique blend of portability, user-friendliness, light-collecting prowess, and affordability. This makes it a telescope that can cater to advanced users while remaining as accessible as intermediate and some beginner scopes.

About StarBright XLT Coatings

StarBright XLT represents Celestron's cutting-edge optical coating technology, outdoing anything else currently available in the commercial telescope market. There are three key elements that elevate StarBright XLT's high-transmission optics:

Multi-layer Mirror Coatings: These are meticulously layered from materials such as aluminum, SiO2 (quartz), TiO2 (titanium dioxide), and SiO2 (silicon dioxide). This results in a spectrum-friendly reflectivity ideal for both imaging and visual observation.
Anti-Reflective Coatings: Crafted from precise layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide), the latter being a rare and pricey element. These coatings deliver a broader band pass compared to what you'll get with titanium-based coatings.
Water White Glass: This type of glass is used for the corrector lens, offering superior light transmission—about 90.5% even without anti-reflective coatings. That's a 3.5% advantage over uncoated soda lime glass. When paired with StarBright XLT's coatings, the average light transmission skyrockets to an impressive 97.4%.

For more details on the proprietary StarBright XLT coatings, you can visit Celestron's dedicated page on the subject.

Specifications

Optical Design:	Schmidt-Cassegrain
Aperture:	150mm (6")
Focal Length:	1500mm (59")
Focal Ratio:	f/10
Focal Length of Eyepiece 1:	25mm (0.98")
Magnification of Eyepiece 1:	60x
Finderscope:	6x30
Star Diagonal:	1.25" Star Diagonal
Optical Tube:	Aluminum
Highest Useful Magnification:	354x
Lowest Useful Magnification:	21x
Limiting Stellar Magnitude:	13.4
Resolution (Rayleigh):	0.93 arc seconds
Resolution (Dawes):	0.77 arc seconds
Light Gathering Power (Compared to human eye):	459x
Secondary Mirror Obstruction:	56mm (2.2")
Secondary Mirror Obstruction by Diameter:	37%
Secondary Mirror Obstruction by Area:	14%
Optical Coatings:	StarBright XLT
Optical Tube Length:	406mm (16")
Optical Tube Diameter:	180mm (7.12")
Optical Tube Weight:	10 lbs (4.54 kg)
Dovetail:	CG-5 Dovetail bar
Solar Warning	Never look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result. Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it. Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.
California Residents	View Proposition 65 Warning

Software and Documentation

6" Schmidt-Cassegrain Optical Tube Assembly Dimensional Drawing

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Celestron C6 SCT OTA - CG5

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