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The NexStar 90SLT is a computerized GoTo telescope built around a 90mm Maksutov-Cassegrain optical tube on a single fork-arm mount. Its SkyAlign routine and pre-assembled tripod get you observing quickly, and the hand control database drives the mount to targets for you. The Maksutov design gives sharp, color-free views of the Moon, planets and double stars, and the tube doubles as a daytime spotting scope. It suits beginners and city observers who want portability and guided finding more than deep-sky light grasp; larger 5- and 6-inch SLT models show fainter objects, while small refractors travel lighter but lack the same aperture in a short tube.
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Owners of the SLT line generally praise the easy alignment and reliable GoTo tracking for the money, and the Maksutov tube draws compliments for crisp lunar and planetary views. The common complaints are the modest aperture for faint objects and the narrow field that makes finding things manually harder.
The NexStar 90SLT is a computerized telescope with a 90mm Maksutov-Cassegrain optical tube on a single fork arm altazimuth mount. The mount tracks objects as they appear to move across the night sky. It sits on a pre-assembled, adjustable stainless-steel tripod, and the kit assembles without tools.
The Maksutov-Cassegrain design combines a lens and a mirror. Light passes through the corrector lens to the primary mirror, then back to a secondary spot of reflective coating on the inside of the corrector plate. Images are bright and sharp, with virtually no chromatic aberration. The small secondary spot gives high-contrast views, and the telescope does not need occasional collimation. The corrector plate is larger and heavier, so it takes longer to cool to the surrounding air temperature than a Schmidt-Cassegrain of the same aperture.
The NexStar+ hand control slews to any of 40,000 celestial objects at the push of a button. Its database includes more than 600 galaxies, 300 clusters and dozens of binary stars. The Sky Tour feature lists the best objects currently visible for your time and location. With SkyAlign, you point the telescope at three bright objects, such as the Moon, bright planets or stars, and it can then locate other objects automatically.
