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Sky-Watcher 127mm f/12.1 Maksutov-Cassegrain Telescope (OTA Only)

BH #SK127MMMCOTA • MFR #S11520
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Sky-Watcher 127mm f/12.1 Maksutov-Cassegrain Telescope (OTA Only)
Key Features
  • 127mm Aperture Maksutov-Cassegrain OTA
  • 1500mm Focal Length, f/12.1 Focal Ratio
  • Limited-Diffraction Optical System
  • Fully Multicoated Optics
Balancing aperture with manageability and representing the mid-range size in the series, the Sky-Watcher 127mm f/12.1 Maksutov-Cassegrain Telescope exchanges the conventional front corrector plate of a Schmidt with a convex meniscus lens, resulting in a smaller secondary mirror that limits obstruction and increases contrast, while eliminating the need for periodic collimation. The Maksutov optical path results in a slower focal ratio and narrower field of view versus a similar Schmidt, but the optical benefits, when coupled with the larger aperture and fully multicoated optics, make this an ideal scope for making detailed solar, lunar, and planetary observations, while being able to resolve bright deep-sky objects like stars, clusters, galaxies, and nebulae.
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Sky-Watcher S11520 Overview

Balancing aperture with manageability and representing the mid-range size in the series, the Sky-Watcher 127mm f/12.1 Maksutov-Cassegrain Telescope exchanges the conventional front corrector plate of a Schmidt with a convex meniscus lens, resulting in a smaller secondary mirror that limits obstruction and increases contrast, while eliminating the need for periodic collimation. The Maksutov optical path results in a slower focal ratio and narrower field of view versus a similar Schmidt, but the optical benefits, when coupled with the larger aperture and fully multicoated optics, make this an ideal scope for making detailed solar, lunar, and planetary observations, while being able to resolve bright deep-sky objects like stars, clusters, galaxies, and nebulae.

The scope is outfitted with a large 2" visual back and, to get users started, Sky-Watcher includes a 28mm long eye relief eyepiece that produces a moderate magnification and a 90° star diagonal for more comfortable viewing when the optical tube assembly (OTA) is pointed at or near the celestial zenith. The OTA is offered here without a mount or tripod for users who have a platform or want to use it as part of a dual-OTA setup for star parties or observation/imaging rigs. It is outfitted with a Vixen-style dovetail plate for easy attachment onto many 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.

Optical Performance
  • 127mm aperture
  • f/12.1 focal ratio
  • 1500mm focal length
  • Front convex meniscus lens corrects spherical and chromatic aberrations and comas (off-axis aberrations) across the entire field of view
  • Smaller secondary mirror versus Schmidt-Cassegrains reduces obstructions and increases contrast
  • Fully multicoated optics maximize light transmission to improve brightness, color rendition, sharpness, and contrast
  • Resolution: 0.91 arcsec
  • Internal primary mirror focus
  • 2" diameter visual back accepts larger eyepieces and accessories
Mounting
  • Requires user-supplied mount and tripod
  • Vixen-style dovetail plate
  • Weight: 9.7 pounds including OTA, dovetail plate, finder, diagonal, and eyepiece
Included Accessories
  • Eyepiece:
  • 2" barrel diameter
  • Accepts most 2" astronomical filters
  • 28mm eyepiece yields 54x power
  • Comfortable long eye relief
  • Diagonal:
  • 2" snout and eyepiece holder
  • 90° angle places head in a comfortable viewing position
  • Star configuration corrects image horizontally for terrestrial use
  • Finderscope:
  • Low 6x magnification provides a wide field of view for easier alignment and faster star-hopping navigation
  • 30mm aperture helps resolve dimmer objects that dot finders cannot
UPC: 050234115209

Sky-Watcher S11520 Specs

Optical Design
Maksutov-Cassegrain
Aperture
127mm
Focal Length
1500mm
Focal Ratio
f/12.1
Eyepiece Barrel Diameter
2"
Diagonal
90° star
2" snout and eyepiece holder
Finderscope
6x30
Tripod
None
Mount Type
Vixen-style dovetail plate
Power Source
N/A
Optical Tube Dimensions
Not specified by manufacturer
Weight
9.7 lb / 4.4 kg
Packaging Info
Package Weight
12.8 lb
Box Dimensions (LxWxH)
28.1 x 9.7 x 9.2"

Sky-Watcher S11520 Reviews

Double Star and Planet Killer

By Thomas
Rated 5 out of 5
Date: 2022-05-09

Tried it on the moon with my camera and images were tack sharp. Will be great for planets this year!

Awesome scope

By Mark
Rated 5 out of 5
Date: 2020-08-20

Very good scope .Nice and portable, great grab and go scope, very good quality.

See any errors on this page?

question

Is there a T-mount adapter for this telescope?
Asked by: Anonymous
As of now there is no T-Mount Adapter for this Scope. My apologies.
Answered by: Alex S.
Date published: 2018-08-26

question

does this telescope come with a 1.25 inch eyepiece adapter? all it says is 2 inch eyepiece and 2 inch diagonal
Asked by: Anonymous
I bought this telescope for my husband, December 2015. It did not include an adaptor for 1.25 eyepieces/accessories. I have had to purchase an adaptor separately.
Answered by: Rhiannon P.
Date published: 2022-01-12

Can this be mounted on the Celestron Heavy-Duty ...

Can this be mounted on the Celestron Heavy-Duty Manual Alt-Azimuth Mount with Tripod, which has a sliding 1/4-inch-20 mounting screw?
Asked by: Tim
The Sky-Watcher 127mm f/13 Maksutov-Cassegrain Telescope (OTA Only) BH #SK127MMMCOTA • MFR #S11520 will not mount to the Celestron Heavy-Duty Manual Alt-Azimuth Mount with Tripod BH #CETHDAA • MFR #93607 without some type of Vixen dove tail adapter. Example: Alpine Astronomical Baader V-Dove Tail Clamp BH #ALVDOVE • MFR #VDOVE
Answered by: John
Date published: 2022-07-24

Does it come with a scope bag?

Does it come with a scope bag?
Asked by: Chotechai
In the Box Sky-Watcher 127mm f/13 Maksutov-Cassegrain Telescope (OTA Only) 90° Star Diagonal 28mm Eyepiece 6x30 Finderscope Limited 2-Year Warranty Sorry no case
Answered by: John
Date published: 2021-02-03
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