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The Maksutov optical design is recognized for being a portable design that is easy to use and has a variety of applications, making it an excellent choice for both terrestrial and astronomical usage. This C90 Mak has excellent optics with razor sharp images over a wide field.
| Optical Design | : | Maksutov Cassegrain |
| Aperture (mm) | : | 90 mm (3.54 in) |
| Focal Length (mm) | : | 1250 mm (49 in) |
| Focal Ratio | : | 14 |
| Angle | : | 0 or 45 ø |
| Eyepiece 1 (mm) | : | 32 mm (1.26 in) |
| Magnification 1 | : | 39 x |
| Finderscope | : | 8x21 |
| Carrying Case | : | Backpack made of nylon |
| Highest Useful Magnification | : | 213 x |
| Lowest Useful Magnification | : | 13 x |
| Limiting Stellar Magnitude | : | 12.3 |
| Resolution (Rayleigh) | : | 1.55 arc seconds |
| Resolution (Dawes) | : | 1.29 arc seconds |
| Light Gathering Power (Compared to human eye) | : | 165 x |
| Angular Field of View (deg) | : | 1.3 ø |
| Linear Field of View (@1000 yds) | : | 68 ft (21 m) |
| Linear Field of View (@1000 m) | : | 23 m (75 ft) |
| Eye Relief (mm) | : | 20 mm (0.79 in) |
| Near Focus (Binoculars) | : | 15 ft (4.57 m) |
| Optical Coatings | : | Multi Coated |
| Optical Tube Length | : | 16 in (406 mm) |
| Weight (lbs) | : | 5 lbs (2.27 kg) |
| Camera Adaptable | : | Optional T Adapter |
| Tripod Adaptable | : | Yes |
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