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

BH #SK102MMMCOTA • MFR #S11510
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Sky-Watcher 102mm f/13 Maksutov-Cassegrain Telescope (OTA Only)
Key Features
  • 102mm Aperture Maksutov-Cassegrain OTA
  • 1300mm Focal Length, f/13 Focal Ratio
  • Limited-Diffraction Optical System
  • Fully Multi-Coated Optics
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.
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Expected availability: Jul 20, 2026
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Sky-Watcher S11510 Overview

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 
Mounting
  • 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

Sky-Watcher S11510 Specs

Optical Design
Maksutov-Cassegrain
Aperture
102mm
Focal Length
1300mm
Focal Ratio
f/12.7
Eyepiece Barrel Diameter
1.25"
Diagonal
90° star
Finderscope
Red dot
Tripod
None
Mount Type
Vixen-style dovetail plate
Power Source
N/A
Optical Tube Dimensions
Not specified by manufacturer
Weight
4.6 lb / 2.1 kg
Packaging Info
Package Weight
8.3 lb
Box Dimensions (LxWxH)
23 x 10 x 10"

Sky-Watcher S11510 Reviews

Best instrument for a beginner

By Bernardo
Rated 5 out of 5
Date: 2026-01-09

It is the best instrument for the first steps in stargazing. After years going around with this telescope I bought it some months ago and I am enjoing amazing views of planets but also star clusters in the southern hemisphere. Also I need to recognize the excelent service of B&H during the buying.

High Quality, Great Value

By Edward
Rated 5 out of 5
Date: 2019-01-27

I have wanted a telescope since middle school, but procrastinated for over 60 years. Now I have a Sky-Watcher 4 Maksutov and life is good. This telescope is the largest size which will work with an iOptron SkyGuider mount, and altogether is portable enough to take out on a whim, or travel by air. The Sky-Watcher is made very well. The construction is solid but not too heavy. The optics are entirely enclosed, except for the opening for an eyepiece or camera. Focusing is by a small knob which moves the primary mirror. There is little or no evidence of wobble in the focusing process. The kit comes with a finder (red dot), star diagonal (mirror), and two eye pieces, 25 mm (52x) and 10 mm (130x), both reasonably good quality Ploessl lenses. The red dot finder (like a gunsight) makes it easy to find objects suitable for the magnification, and is simple to align on a bright object (e.g., Sirius or the moon). With the addition of an inexpensive camera adapter and T-mount, the Sky-Watcher becomes a 1300 mm lens, perfect fo sharing the moon and most Messier objects with friends. The FOV with a FF camera is about 1.2 arc-degrees. A 4 aperture can be used to view objects as dim as Magnitude 12 or 13. A larger scope and eyepiece (2 v 1.25) would be better for viewing or astrophotography, but much heavier and starting at 4x the cost (including mount). Im extremely happy for now, and its something to share with my grandchildren. Best of all, it arrived in time for the Blood Wolf Super Moon eclipse on 1-20-19.

See any errors on this page?

What mounts are you using?

What mounts are you using?
Asked by: Gary
The Sky-Watcher 102mm f/13 Maksutov-Cassegrain Telescope (OTA Only) does not come with a mount but this Skywatcher GTI mount is recommended and sold in a kit with the telescope. Please take a look at the following link: https://bhpho.to/3B4y5I6
Answered by: Dan W
Date published: 2022-09-01

Is it possible to use a 9x50 RACI finder with this

Is it possible to use a 9x50 RACI finder with this scope?
Asked by: Michael
Yes, the Sky-Watcher 102mm f/13 Maksutov-Cassegrain Telescope (OTA Only) is compatible with the Celestron 9x50 Right-Angle Correct Image (RACI) Finderscope (Non-Illuminated), BH # CE9X50CIFSA MFR # 93788.
Answered by: Dan W
Date published: 2026-05-18

What is the weight of just the scope?

What is the weight of just the scope?
Asked by: Erick
The weight of the OTA is about 4 lbs.
Answered by: John
Date published: 2023-05-07

question

Do you have the adapater needed to connect the back of the telescope (T thread) to the Celestron f/6.3 Reducer (SCT thread)?
Asked by: Wayne R.
You can adapt the Celestron reducer by using the Blue Fireball SCT Thread Adapter for Maksutov-Cassegrain Telescopes # C-07 which we do not sell. We have never tested a reducer on this telescope so we cannot state the performance will be good.
Answered by: Dan W
Date published: 2019-09-26

can you mount a Sony A6600 to the telescope and ...

can you mount a Sony A6600 to the telescope and if so what parts do i need. also can you mount a Samsung Note 8? Thanks
Asked by: Michael
Hello, The smartphone, can connect with the : https://www.bhphotovideo.com/c/product/1201285-REG/tele_vue_sfa_0001_fonemate_universal_smartphone_adapter.html You A6600 can connect to the scope with two T mpiunt parts: https://www.bhphotovideo.com/c/product/202135-REG/Celestron_93625_SLR_35mm_OR_Digital.html https://www.bhphotovideo.com/c/product/839140-REG/vello_la_nex_t_lens_mount_adapter.html
Answered by: Leonard E
Date published: 2020-10-12

Does this scope (S11510) come with storage case ...

Does this scope (S11510) come with storage case as indicated on Sky-WatcherUSA website?
Asked by: Mickey
The Sky-Watcher 102mm f/13 Maksutov-Cassegrain Telescope (OTA Only) BH #SK102MMMCOTA • MFR #S11510 comes with a soft caring case as indicated on Sky-Watcher website
Answered by: John
Date published: 2022-07-11

can I use a 3x barlow lens with this?

can I use a 3x barlow lens with this?
Asked by: Adrian
Yes you can use a 3x Barlow with the Sky-Watcher 102mm f/13 Maksutov-Cassegrain Telescope.
Answered by: Dan W
Date published: 2019-09-03

question

Can this skywatcher scope be mounted celestron's heavy duty alta az mount?
Asked by: Bryan P.
Yes this would be able to Mount on a Celestron Heavy-Duty Manual Alt-Azimuth Mount with Tripod.
Answered by: Alex S.
Date published: 2025-01-27
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