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This is a used Celestron 700 (7") Maksutov OTA in excellent condition. The optics are clean; there are no marks on the tube. This includes the 8x50 finderscope, 2" diagonal, and 28mm eyepiece that originally came with the scope.
This comes in its original packaging, so it can be shipped.
- 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.
| Optical Deisgn | 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" adapter |
| Optical Tube | Aluminum |
| 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 |