Sky-Watcher 102mm f/13 Maksutov-Cassegrain Telescope (OTA Only)

Sky-Watcher 102mm f/13 Maksutov-Cassegrain Telescope (OTA Only)

Sky-Watcher 102mm f/13 Maksutov-Cassegrain Telescope (OTA Only)

B&H # SK102MMMCOTA MFR # S11510
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Value: $46.99

Product Highlights

  • 102mm Aperture Maksutov-Cassegrain OTA
  • 1300mm Focal Length, f/13 Focal Ratio
  • Limited-Diffraction Optical System
  • Fully Multi-Coated Optics
  • Internal Primary Mirror Focusing System
  • 25 & 10mm 1.25" Eyepieces
  • 1.25" 90° Star Diagonal
  • Red Dot Finderscope
  • Vixen-Style Dovetail Plate
  • OTA Only - Mount and Tripod Required
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Sky-Watcher S11510 overview

  • 1Description

Similar to their Schmidt cousins, this 102mm f/13 Maksutov-Cassegrain Telescope from Sky-Watcher exchanges the conventional front corrector plate with a convex meniscus lens, which results in a smaller secondary mirrorlimiting obstruction and increasing 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 multi-coated optics, make this an ideal scope for solar, lunar, planetary, and deep-sky observation of bright objects like stars and clusters.

The scope is outfitted with a 1.25" visual back and, to get users started, Sky-Watcher includes 10 and 25mm eyepieces that produce low and moderate magnifications 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
  • 102mm aperture
  • f/13 focal ratio
  • 1300mm 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 multi-coated optics maximize light transmission to improve brightness, color rendition, sharpness, and contrast
  • Resolution: 1.01 arcsec
  • Internal primary mirror focus
  • 1.25"-diameter visual back takes 1.25” eyepieces and accessories 
  • Requires user-supplied mount and tripod
  • Vixen-style dovetail plate
  • Weight: 4.6 pounds including OTA, dovetail plate, finder, diagonal, and eyepiece
Included Accessories
  • Eyepieces:
  • 1.25" barrel diameter
  • Accept most 1.25" astronomical filters
  • 25mm eyepiece yields 52x power
  • 10mm eyepiece produces 130x magnification
  • Diagonal:
  • 1.25" snout and eyepiece holder
  • 90° angle places head in a comfortable viewing position
  • Star configuration corrects image horizontally for terrestrial use
  • Finderscope:
  • Unmagnified view provides a wide field of view for easier alignment and faster star-hopping navigation
  • Red center aiming dot won't obstruct objects
  • Variable intensity to preserve night-adjusted vision
UPC: 050234115100
In the Box
Sky-Watcher 102mm f/13 Maksutov-Cassegrain Telescope (OTA Only)
  • 90° Star Diagonal, 1.25" Barrel
  • 25mm Eyepiece, 1.25" Barrel
  • 10mm Eyepiece, 1.25" Barrel
  • Red Dot Finderscope
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description

    Sky-Watcher S11510 specs

    Optical Tube Assembly
    Optical Design Maksutov Cassegrain
    Aperture 102 mm / 4"
    Focal Length 1300 mm
    Focal Ratio f/12.7
    Eyepiece Barrel Diameter 1.25"
    Diagonal Yes, 90 Star
    Finderscope Yes
    Mounting System Vixen Style
    Weight 4.6 lb / 2.1 kg
    Packaging Info
    Package Weight 10.0 lb
    Box Dimensions (LxWxH) 23.0 x 10.0 x 10.0"

    Sky-Watcher S11510 reviews

    102mm f/13 Maksutov-Cassegrain Telescope (OTA Only) is rated 5.0 out of 5 by 2.
    Rated 5 out of 5 by from Sharp optics in a small, affordable package. Don't let this little Maksutov's size fool you! This little 4 inch scope provides sharp, crisp, views of solar system objects, double stars, and the brighter deep sky objects. The views have excellent contrast, focusing is very smooth, and the Vixen/Synta style dovetail with 1/4-20 mounting holes provides many options for available tripods. The included eyepieces, and diagonal, along with the easy to use red dot reflex finder, make this an excellent package to get you started. Plus, the scope comes packaged in a nice soft carrying bag, making this a good choice for a grab and go scope for quick viewing sessions. It also includes a 1.25 visual back, that is threaded to accept a T ring camera mount. For my first viewing session, I mounted it to my Explore Scientific Twilight 1 mount, and enjoyed some great views of Jupiter, the globular star cluster, M13 in Hercules, and late in the evening, fantastic views of Saturn. The optics are sharp enough to easily handle being pushed to 150x magnification on an evening of mediocre seeing. I was able to couple my Rebel T5 to the scope the first session, along with a 2x barlow, and get a nice image of Jupiter. The attached, single image, is simply cropped, and lightened up just a bit, no other processing was applied. Every time I use it, I am amazed at the detail it is able to resolve, being such a small instrument. Sky Watcher offers a true winner with this scope, combined with the included accessories. As an added bonus, this can be used as a full manual, 1300mm telephoto lens during the daytime.
    Date published: 2017-05-29
    Rated 5 out of 5 by from Great Scope in a Small Package Scope arrived in perfect condition. Collimation was dead on. No image shift when focusing. Views of Mars, Saturn and Jupiter were much better than I hoped for! With an orange filter, markings on Mars were visible. Highly recommended if you like small scopes!
    Date published: 2018-08-29
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