Celestron NexStar 90SLT 90mm f/14 Maksutov-Cassegrain GoTo Telescope

Designed as a highly portable and user-friendly entry- to mid-level astronomical observation platform, the Celestron NexStar 90SLT 90mm f/14 Maksutov-Cassegrain GoTo Telescope gives you the ability to make detailed observations of the Moon, with the ability to easily see planets and reach outside the solar system to resolve bright deep-space objects like galaxies, nebulae, and binary or variables stars. The compact and powerful Maksutov-Cassegrain design uses a front corrector plate with a convex meniscus lens to correct off-axis aberrations, like comas, and chromatic aberration to produce images with true color rendition. The nature of the lens results in a smaller secondary mirrorlimiting obstruction and increasing contrast, while eliminating the need for periodic collimation.

The brain of the NexStar SLT is the venerable NexStar computer controller. Equipped with a database of over 4000 objects, including the planets, stars, nebulae, galaxies, and the complete Messier catalog, it can also be programmed with up to 99 custom user-defined objects and filters for custom object lists. Its intuitive menu-driven user interface provides the power to observe the heavens with nine slew speeds and three tracking rates, plus anti-backlash compensation. Features such as guided tours, extended information on 200 popular objects, and multiple assisted alignment procedures make the NexStar controller easy to use and invaluable to new users and experienced stargazers.

Optical Tube

• 90mm aperture
• f/14 focal ratio
• 1250mm focal length
• Maksutov-Cassegrain optical design
• Front convex meniscus lens corrects spherical and chromatic aberrations and comas (off-axis aberration) across the entire field of view
• Compared to Schmidt-Cassegrains, a smaller secondary mirror reduces obstructions and increases contrast
• Fully coated optics improve light transmission, color rendition, and contrast
• Resolution: 1.55 arcsec (Rayleigh) 1.29 arcsec (Dawes)
• Internal focusing system
• Vixen-style dovetail plate