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

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

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

B&H # SK90MMMCOTA MFR # S11500
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Product Highlights

  • 90mm Aperture Maksutov-Cassegrain OTA
  • 1250mm Focal Length, f/14 Focal Ratio
  • Limited-Diffraction Optical System
  • Fully Multi-Coated Optics
  • Internal Primary Mirror Focusing System
  • 25mm & 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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Price: $220.00

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$0.00 Tax Collected Outside NY and NJ

You Pay:  $190.00

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  • 1Description

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 10mm 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 as well as comas (off-axis aberration) 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 accepts larger eyepieces
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

Finder

  • 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
In the Box
Sky-Watcher 90mm f/14 Maksutov-Cassegrain Telescope (OTA Only)
  • 90° Star Diagonal
  • 25mm Eyepiece
  • 10mm Eyepiece
  • Red Dot Finderscope
  • Limited Two-Year Warranty
  • Table of Contents
    • 1Description
    Optical Design Maksutov-Cassegrain
    Aperture 3.5" / 90mm
    Focal Length 1250 mm
    Focal Ratio f/13.8
    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 3.6 lb / 1.6 kg
    Packaging Info
    Package Weight 8.35 lb
    Box Dimensions (LxWxH) 22.4 x 10.1 x 9.8"
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