Celestron 7″ f/15 XLT Maksutov-Cassegrain Optical Tube Assembly


  • Optical Tube Assembly only available exclusively from David Hinds Ltd
  • 180mm/7″ Maksutov-Cassegrain telescope with f/15 focal ratio
  • Provides high contrast views of the planets and lunar landscapes
  • Perfect for serious planetary imagers and visual observers.
  • Celestron’s premium StarBright XLT optical coatings ensure maximum light transmission.
  • Accessories included: 2” Visual Back, 2” Star Diagonal with 1.25” adapter, 28mm eyepiece (2”), 8×50 finderscope.

Availability: In stock


The 7″/180mm aperture Maksutov-Cassegrain (or Mak for short) is a specialised instrument designed for detailed, high contrast views that sets a new standard in mid-level telescopes. With its Maksutov-Cassegrain optical tube the telescope provides unparalleled views of the planets and up-close views of the lunar surface, including craters and maria.

Maksutov-Cassegrain Optical Design

The Mak is a catadioptric telescope, which means the optical design includes both a lens and a mirror. The light coming through a Mak passes through the corrector lens to the primary mirror and back to a spherical secondary mirror before it hits the eyepiece. Images are bright, sharp, and virtually free of chromatic aberration.

Mak Optical Design

The Mak’s optical design offers several unique benefits. Instead of a secondary mirror, the Mak features a “secondary spot” of reflective coating applied directly to the inside of the corrector plate. Because of this, the telescope does not require frequent collimation like a Schmidt-Cassegrain. Also, the secondary spot is significantly smaller than a traditional Schmidt-Cassegrain secondary mirror, giving the Mak its signature high-contrast views.

One important thing to note about Mak telescopes is that the larger, heavier Maksutov corrector plate takes longer to cool down and adjust to ambient air temperature compared to a Schmidt-Cassegrain of the same aperture.

Accessories Included

The Mak comes complete with a 2” Visual Back, a 2” Star Diagonal with 1.25” adaptor, a 28 mm wide-field 2” eyepiece, and a large 8×50 straight-through finderscope. The optical tube accommodates the larger 2” accessories.

Optical DesignMaksutov-Cassegrain
Aperture180mm (7.08″)
Focal Length2700mm (106.3″)
Focal Ratiof/15
Focal Length of Eyepiece 128mm (1.1″) 2″ eyepiece
Magnification of Eyepiece 196x
Finderscope8×50 Straight Through
Star Diagonal2″ Star Diagonal with 1.25″ adaptor
Optical TubeAluminium
Highest Useful Magnification420x
Lowest Useful Magnification67x
Limiting Stellar Magnitude13.9
Resolution (Rayleigh)0.64 arc seconds
Resolution (Dawes)0.52 arc seconds
Light Gathering Power (Compared to human eye)661x
Central Obstruction Diameter42mm (1.65″) (5.45% of aperture area; 23.3% by diameter)
Optical CoatingsStarBright XLT
Optical Tube Length571.5mm (22.5″)
Optical Tube Diameter222.25mm (8.75″)
Optical Tube Weight19 lbs (8.6 kg)
DovetailCGE Dovetail Bar

7″ Maksutov-Cassegrain Optical Tube Manual

Additional information

Weight10 kg