iOptron 90mm OTA R90 Doublet Refractor Telescope
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iOptron 90mm OTA R90 Doublet Refractor Telescope

SKU: ATIOTAR90

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Shopper : Why Did You Choose This?Dwayne C : First refractor telescope.ROBERT R : Researched. Fast f#. Price. Features.WILLIS B : My best choice for a guidescope for my 13 inch mak-cass. Not available through my usual sources.

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iOptron R90 Doublet Specifications

  • Mount Type

    Vixen-style dovetail

  • Optical Design

    Air Spaced Doublet Refractor

  • Aperture

    90mm / 3.54"

  • Ratio

    f/5.6

  • Resolution Power

    1.29 arc sec

  • Limited Magnitude

    11.5

  • Highest Useful Magnification

    180X

  • Focuser

    1.25" rack-and-pinion

  • Eyepiece Adapter

    1.25" / 31.75mm

  • Eye Pieces

    25mm / 0.98"(20X) and 10mm / 0.39" (50X)

  • Diagonal

    45 deg. Erect Prism Diagonal

  • Length

    Focal Length: 500mm / 19.69"
    Optical Tube Length: 19.0" / 482.60mm, without diagonal and eyepiece

  • Weight

    4.0lbs / 1.81kg, with diagonal and eyepiece

About iOptron R90 Doublet

The iOptron 90mm OTA (R90) is a great astronomy telescope that is a powerful yet portable enough to take anywhere. With fully multi-coated achromatic optics, the R90 reveals brighter and sharper images. The wide field of view of a 90mm objective lens and short 500mm (f/5.6) focal length are perfect for night sky observation, making it ideal for Moon, planets and larger deep-sky objects.

Comes with 2 optical eyepieces (10mm and 25mm) and a 45 deg. erect prism diagonal, the R90 is also a good portable scope for bird watching and terrestrial observation. The equipped dovetail makes it fit to any telescope mount that accepts Vixen-style dovetail. The R90 is an excellent mate for iOptron's Cube or CubePro GOTO telescope mount.

iOptron R90 Doublet Features

  • 90mm Refractor/ f5.6
  • Focal length 500mm
  • Two Optical Eyepieces (10mm and 25mm)
  • 45 deg. Erect Prism Diagonal
  • Dust cap
  • Vixen dovetail plate
  • One year limited warranty

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Key Features

  • 45 deg. Erect Prism Diagonal
  • 90mm Refractor/ f5.6
  • Dust cap
  • Focal length 500mm
  • One year limited warranty
  • Two Optical Eyepieces (10mm and 25mm)

What's in the box:

  • iOptron 90mm OTA R90 Doublet Refractor Telescope
  • 25mm Eyepiece
  • 10mm Eyepiece
  • 45deg. Erect-Image Diagonal
  • Frong Dust Cap
  • iOptron 1 Year Limited Warranty