Sky Watcher 90mm Maksutov-Cassegrain Telescope # S11500

Our Price: $220.00
Free shipping for this item in the Contiguous US Only Click here for more info

Contiguous US Customers:
All items we sell ship for free within the Contiguous US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.

US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.

International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.

In Stock (1 Available)
Ships in 1-2 Business Days
Our Product ID: T-SW-S11500
Manufacturer SKU: S11500
Item Can Ship: To US Only
Sky Watcher 90mm Maksutov-Cassegrain Telescope # S11500

More Views

  • Sky Watcher 90mm Maksutov-Cassegrain Telescope # S11500
  • Sky Watcher 90mm Maksutov-Cassegrain Telescope # S11500
  • Sky Watcher 90mm Maksutov-Cassegrain Telescope # S11500
  • Sky Watcher 90mm Maksutov-Cassegrain Telescope # S11500
  • Sky Watcher 90mm Maksutov-Cassegrain Telescope # S11500

Please note: Due to high shipping costs and low profit margins on this item, we might ship this from our stock or have the manufacturer drop ship this item to you.

  • If this page lists the item as "In Stock", your order will ship within 3 days either from us or from the manufacturer.
  • If this page lists the item as "Back Order" or "Drop Ship", it will be drop shipped from the manufacturer subject to their availability. In case of any delays for back-ordered or drop-shipped items, we will contact you promptly and update you on its status. Or you can contact us first and we can get you a shipping estimate before you order.

Quick Overview

  • 90mm Maksutov-Cassegrain
  • 1250 mm (f/13.8)
  • Fully multi-coated
  • Red Dot finder
  • 1.25” 90 degree Star diagonal
  • 25mm and 10mm Plössl eyepieces
  • Black V-style dovetail plate

Product Details

The Sky-Watcher Maksutov-Cassegrains are the ultimate take-anywhere telescopes. Despite their small dimensions they pack a powerful punch. Their high-resolution, diffraction-limited optical systems are multi-coated to maximize contrast and image sharpness.


  • Optical Design: Maksutov-Cassegrain
  • Aperture (mm): 90 mm (3.54 in)
  • Focal Length: 1250 mm
  • Focal Ratio: f/13.8
  • Finderscope: Red Dot Finder
  • Diagonal: 1.25” 90 degree Star diagonal
  • Highest Useful Magnification: 180x
  • Optical Coatings: Fully multi-coated
Additional Information:
  • OTA length: 10"
  • OTA width: 4.125"
  • OTA weight (with accessories): 3.6 lbs

Product carries full 2 year manufacturer factory limited warranty (within US only).

Manufacturer part number: S11230

Manufacturer Sky Watcher
General Specs
Focuser Primary Mirror
OTA Length 11" (Retract/Ext.)
OTA Outer Diameter 4.125"
OTA Weight (with accessories) 3.6 lb
Optical Specs
Optical Design Mak-Cass
Mirror Coatings 94% Aluminum
Lens Coatings Fully Multi-Coated
Glass Type BK7/Borosilicate
True Aperture (mm) N/A
Primary Aperture (mm) 90
Primary Edge Thickness N/A
F/Ratio 13.9
Focal Length (mm) 1250
Secondary Diameter 29mm
Secondary Obstruction (by diameter) 32%
Secondary Obstruction by Area 10%
Included Accessories
Included Finder Red Dot
Included Diagonal 1.25" Star Diagonal
Mounting Accessories 1/4-20" Foot
Included Eyepieces 25/10 Wide Angle
Magnification w/ Included Eyepieces 50x/125x
Included Case Yes
Corrector No
Observational Specs.
Dawes Limit 1.29
Rayleigh Limit 1.55
Limiting Mag. 12.3
Minimum Magnification 13
Maximum Magnification 177
Light Gathering (compared to next size down) 27%