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- 700 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 coatings ensure maximum light transmission.
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 Maksutov-Cassegrain’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 Maksutov-Cassegrain 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.
|Focal Length||2700mm (106.3")|
|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" adapter|
|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|