The Maksutov design is well-known for its portability, ease of use, and wide range of applications, making it a great option for both land-based and astronomical viewing. The C90 Mak delivers impressive optics with crisp, razor-sharp images across a broad field of view.
The MAK is a catadioptric spotting scope, meaning its construction combines both a lens and a mirror. Incoming light passes through the corrector lens, reflects off the primary mirror, and then onto a spherical secondary mirror before reaching the eyepiece. The result is bright, sharp visuals that are virtually free from chromatic aberration.
The Maksutov-Cassegrain design offers several advantages. Instead of a traditional secondary mirror, the MAK uses a reflective “secondary spot” applied directly to the inner surface of the corrector plate. This eliminates the need for frequent collimation. Additionally, the smaller secondary spot contributes to the MAK’s well-known, high-contrast image quality.
It’s important to note that due to the larger and heavier corrector plate, a Maksutov-Cassegrain spotting scope requires more time to cool down and adapt to the surrounding air temperature.
| Specification | Details |
|---|---|
| Optical Information | |
| Magnification | 39x (with included eyepiece) |
| Objective Lens Diameter | 90mm (3.54") |
| Eyepiece | 32mm Plössl (1.26") |
| Angular Field of View | 1.3° |
| Linear Field of View | 68 ft (20.7 m) @ 1000 yds/m |
| Focal Length | 1250mm (49") |
| Exit Pupil | 2.3mm (0.1") with included eyepiece |
| Eye Relief | 20mm (0.78") with included eyepiece |
| Close Focus | 15 ft (4.6 m) with included eyepiece |
| Twilight Factor | 59.2 with included eyepiece |
| Relative Brightness | 5.3 with included eyepiece |
| Lens Coatings | Multi-Coated |
| Prism Glass | BaK4 |
| Prism Coatings | N/A |
| Mechanical & Build Information | |
| Weight | 74 oz (2,100 g) |
| Dimensions | 400 x 260 x 260 mm (15.7" x 10.2" x 10.2") with included eyepiece |
| Environmental Protection | Water Resistant |
| Nitrogen Filled | No |
| Tripod Adaptable | Yes (two 1/4-20 mounts & CG-5 Dovetail Rail) |
| Camera Adaptable | Yes |
| Included Accessories | |
| Carrying Case | Black heavy woven nylon backpack |
| Included Items | Plössl 32mm Eyepiece | 45° Diagonal | 8x21 Finderscope | Objective Lens Cover | Eyepiece Lens Cap | Backpack Case |
