About this product
Part Number: 22058-CGL
The Celestron Astromaster 90EQ Maksutov Cassegrain Telescopes is ideal for observing solar system and brighter deep space objects.
Discover the solar system with this high quality Maksutov telescope. With its longer focal length and sharp optics the 90mm Maksutov is ideally suited to high resolution views of the moon and planets.
Furthermore when used with a longer focal length eyepiece (not included) the 90mm Maksutov will also deliver decent views of deep sky targets.
Manual German Equatorial telescope
The AstroMaster mount comes with two slow motion control knobs that allow you to make fine pointing adjustments to the telescope in both Right Ascension and Declination axes, also referred to as RA and DEC.
The benefit of the Equatorial mount once roughly polar aligned are felt particularly for high power work where you can follow the motion of the target by using only the Ra slow motion.
Accessories include a 20mm and 10mm eyepiece, and a finderscope. The two eyepieces offer different magnifications for low and high powered views.
Starry Night Software
Download Celestron’s Starry Night Software and learn about the night sky, celestial objects, and how to plan your next observing session. Celestron Starry Night Software is the premier astronomy software package on the market, providing resources and knowledge to view our solar system and beyond.
- Aperture: 90mm
- Focal Length: 1250mm
- Focal Ratio: F14
- 10mm Eyepiece magnification: 125x
- 20mm Eyepiece Magnification: 50x
- Finderscope: Red Dot Finder
- Star Diagonal: Erect Image 1.25"
- Optical Coatings: Fully Coated
- Dovetail: CG3/Vixen Style
- Mount Type: Manual Equatorial
- Mount Height Range: 812mm to 1295mm
- Tripod Leg Diameter: 1.25" Steel
- Included Software: Celestron Starry Night Basic Edition Software and SkyPortal App
Maksutov-Cassegrain Optical Design
The Maksutov-Cassegrain (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. We recommend assembling your telescope outside before dusk so it has time to cool before observing.
What's in the box
- Optical tube
- Mount and tripod (preassembled)
- 20mm and 10mm eyepiece
- StarPointer™ red dot finderscope
- Erect image diagonal
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