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

£899.00
SKU 91012

Availability: Immediate Dispatch

  • 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”), 8x50 finderscope.
Description

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 8x50 straight-through finderscope. The optical tube accommodates the larger 2” accessories.

Specifications
OPTICAL TUBE INFO:
Optical Design Maksutov-Cassegrain
Aperture 180mm (7.08")
Focal Length 2700mm (106.3")
Focal Ratio f/15
Focal Length of Eyepiece 1 28mm (1.1") 2" eyepiece
Magnification of Eyepiece 1 96x
Finderscope 8x50 Straight Through
Star Diagonal 2" Star Diagonal with 1.25" adaptor
Optical Tube Aluminium
Highest Useful Magnification 420x
Lowest Useful Magnification 67x
Limiting Stellar Magnitude 13.9
Resolution (Rayleigh) 0.64 arc seconds
Resolution (Dawes) 0.52 arc seconds
Light Gathering Power (Compared to human eye) 661x
Central Obstruction Diameter 42mm (1.65") (5.45% of aperture area; 23.3% by diameter)
Optical Coatings StarBright XLT
Optical Tube Length 571.5mm (22.5")
Optical Tube Diameter 222.25mm (8.75")
Optical Tube Weight 19 lbs (8.6 kg)
Dovetail CGE Dovetail Bar
Downloads

7" Maksutov-Cassegrain Optical Tube Manual 

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