Celestron Omni XLT 120 Telescope

120mm f/8.33 Refractor with StarBright XLT Coatings

At the heart of the Omni XLT 120 is a large-aperture achromatic refractor, engineered for high-contrast images with minimal spherical aberration. Celestron employs aspheric shaping and hand-figured optics to produce sharp, detailed views, which are further enhanced by their proprietary StarBright XLT coatings for maximum light throughput. The 1000mm focal length provides the power needed to resolve planetary details, split tight double stars, and frame smaller deep-sky objects against a dark background.

Omni CG-4 Mount: A Stable Platform with 1.75" Steel Legs

A stable mount is critical for steady, high-magnification viewing, and the Omni CG-4 delivers. This German equatorial mount features robust 1.75" stainless steel tripod legs that dampen vibrations quickly. Ball bearings in both axes ensure smooth manual slow-motion tracking of celestial objects. The package includes a 7 lb and a 4 lb counterweight, providing ample mass to perfectly balance the 12.5 lb optical tube for effortless control.

0.97 Arc Second Resolution: Planetary and Deep-Sky Performance

The 120mm aperture and quality optics achieve a theoretical resolution of 0.97 arc seconds, allowing you to push magnification up to 283x on nights of good seeing. This resolving power makes it possible to see the Cassini Division in Saturn's rings, cloud bands on Jupiter, and the polar caps of Mars. For deep-sky observers, the telescope's ability to reach magnitude 12.9 stars reveals faint globular clusters, bright galaxies, and intricate details within nebulae like the Orion Nebula (M42).

• Included 25mm Eyepiece: Provides a 40x magnification and a 1.25° apparent field of view, ideal for locating objects and observing large star clusters.
• 6x30 Finderscope: A bright, wide-field finder that makes aligning on your target straightforward and intuitive.
• Manual Slow-Motion Controls: Allows for fine adjustments in Right Ascension and Declination to keep objects centered in the eyepiece as the Earth rotates.

Omni XLT 120 Refractor vs. a 5" SCT: A Study in Contrast

When choosing a telescope, many observers weigh the Omni XLT 120 against a 5" Schmidt-Cassegrain Telescope (SCT). While both have similar apertures, their strengths are different.

• Refractor's Advantage: The Omni XLT 120, with its unobstructed optical path, delivers higher contrast views. This makes it a superior instrument for lunar and planetary observing, where subtle variations in brightness are key. There is no central obstruction, which can slightly degrade image contrast in reflecting designs.
• SCT's Advantage: A typical 5" SCT has a much shorter, more compact optical tube, making it more portable and easier to handle. It also often has a longer focal length, which is beneficial for high-power planetary imaging without needing a Barlow lens. The trade-off is slightly lower image contrast due to the secondary mirror obstruction.

For the visual observer who prioritizes the sharpest, highest-contrast planetary views possible from a 120mm-class instrument and values the stability of a solid equatorial mount, the Omni XLT 120 is the definitive choice.