Sky-Watcher 90mm f/14 Maksutov-Cassegrain Telescope (OTA Only)

BH #SK90MMMCOTA • MFR #S11500
Sky-Watcher
Sky-Watcher 90mm f/14 Maksutov-Cassegrain Telescope (OTA Only)
Key Features
  • 90mm Aperture Maksutov-Cassegrain OTA
  • 1250mm Focal Length, f/14 Focal Ratio
  • Limited-Diffraction Optical System
  • Fully Multi-Coated Optics
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Similar to their Schmidt cousins, this 90mm f/14 Maksutov-Cassegrain Telescope from Sky-Watcher exchanges the conventional front corrector plate with a convex meniscus lens, which results in a smaller secondary mirror. This 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 make this an ideal scope for planetary and double-star observation.
Back-Ordered - Special Order
Expected availability: Mar 01, 2021
$220.00
$37/mo. suggested payments.*
with 6 Mos. Promo Financing
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Sky-Watcher S11500 Overview

  • 1Description
  • 2Optical Performance
  • 3Mounting
  • 4Included Accessories

Similar to their Schmidt cousins, this 90mm f/14 Maksutov-Cassegrain Telescope from Sky-Watcher exchanges the conventional front corrector plate with a convex meniscus lens, which results in a smaller secondary mirror. This 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 make this an ideal scope for planetary and double-star observation.

The scope is outfitted with a 1.25" visual back. 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

  • 90mm aperture
  • f/14 focal ratio
  • 1250mm 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: 1.3 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: 3.6 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 50x power
  • 10mm eyepiece produces 125x 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: 050234115001

Sky-Watcher S11500 Specs

Optical DesignMaksutov-Cassegrain
Aperture3.5" / 90mm
Focal Length1250mm
Focal Ratiof/13.8
Eyepiece Barrel Diameter1.25"
Diagonal90° star
FinderscopeRed dot
TripodNone
Mount TypeVixen-style dovetail plate
Power SourceN/A
Optical Tube DimensionsNot specified by manufacturer
Weight3.6 lb / 1.6 kg
Packaging Info
Package Weight8.35 lb
Box Dimensions (LxWxH)22.4 x 10.1 x 9.8"
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