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.
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.
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 TUBE INFO:|
|Focal Length||2700mm (106.3″)|
|Focal Length of Eyepiece 1||28mm (1.1″) 2″ eyepiece|
|Magnification of Eyepiece 1||96x|
|Finderscope||8×50 Straight Through|
|Star Diagonal||2″ Star Diagonal with 1.25″ adaptor|
|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|