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Similar to their Schmidt cousins, this 5" f/12.1 Maksutov-Cassegrain Telescope from Sky-Watcher exchanges the front corrector plate with a convex meniscus lens which not only eliminates the need for periodic collimation, but the nature of the lens requires a smaller secondary mirror which limits obstruction and increases contrast. The Mak-Cass optical path results in a slower focal ratio and narrower field of view versus a similar Schmidt-Cass, but the optical benefits makes this an ideal scope for planetary and double-star observation.
The scope is outfitted with a 2" back focus and to get users started, Sky-Watcher includes a 28mm eyepiece with a 2" barrel that produces 55x power and a 90° star diagonal for viewing with the OTA pointed at or near the celestial zenith. The OTA is offered here without a mount or tripod for users that have a platform, or want to use it as part of a dual-OTA set up for star-parties or observation/imaging rigs. It is outfitted with a Vixen-style dovetail plate for use with compatible equatorial or alt-az mounts. This OTA's compact form-factor belies its observation power and resolution and is ideally suited as a grab-and-go option for quick observation sessions or heading out to remote locations.
5" / 127mm aperture
f/12.1 focal ratio
1540mm focal length
Front convex meniscus lens corrects spherical and chromatic aberrations, and comas (off-axis aberration) across the entire field of view
Smaller secondary mirror versus Schmidt-Cassegrains reduces obstructions and increases contrast
Anti-reflection fully multicoated optics reduce light loss for increased image brightness