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Celestron C90 MAK Spotting Scope
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.
Maksutov-Cassegrain Optical Design
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.
TECHNICAL SPECIFICATION
+
SPECIFICATIONS
DETAILS
Magnification
39x (with included eyepiece)
Objective Lens Diameter
90 mm (3.54")
Eyepiece
32mm Plössl (1.26")
Angular Field of View
1.3° with included eyepiece
Linear Field of View
68 ft (20.7 m) @1000 yds/m with included eyepiece
Focal Length
1250 mm (49")
Exit Pupil
2.3 mm (0.1") with included eyepiece
Eye Relief
20 mm (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
Weight
2.1 kg (74 oz)
Dimensions
400 × 260 × 260 mm (15.7" × 10.2" × 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
Plössl 32mm Eyepiece | 45° Diagonal | 8×21 Finderscope | Objective Lens Cover | Eyepiece Lens Cap | Black Nylon Backpack Case
☀️ Solar Warning:
➠ Never look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result..
➠ Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it.
➠ Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.
BRAND
Celestron
COUNTRY OF ORIGIN
China
EXIT PUPIL
2.3
EYE RELIEF
20mm
FOCAL LENGTH
Between 1000mm to 1500mm
FOCAL LENGTH(MM)
1250
IN THE BOX
Plössl 32mm Eyepiece | 45° Diagonal | 8x21 Finderscope | Objective Lens Cover | Eyepiece Lens Cap | Backpack Case