iOptron R90 90mm f/5.6 Doublet Refractor Telescope (OTA Only)

iOptron R90 90mm f/5.6 Doublet Refractor Telescope (OTA Only)

iOptron R90 90mm f/5.6 Doublet Refractor Telescope (OTA Only)

B&H # IO8711 MFR # 8711
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Expected availability: 7-14 business days

Product Highlights

  • 90mm Acromatic Refractor
  • 500mm Focal Length, f/5.6 Focal Ratio
  • Anti-Reflection Fully Multicoated Optics
  • 1.25" Focuser, 10mm and 25mm Eyepieces
  • 45° Erect-Image Diagonal Prism
  • Vixen-Style Dovetail Plate
  • Requires Mount and Tripod
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You Pay: $189.00

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  • 1Description

The R90 90mm f/5.6 Doublet Refractor Telescope from iOptron features a doublet achromatic lens system with their proprietary anti-reflection fully multicoated optics to produce images with reduced chromatic and spherical aberrations for clear and bright images without distortion across the entire field of view, with true color rendition. This is a versatile optical tube assembly that can be employed as a simple grab-and-go primary telescope, or as a terrestrial spotting scope. It has a fast f/5.6 focal length which makes it ideal for astrophotography of the Moon, planets, or bright and large deep-sky objects.

Two included eyepieces yield magnification of 20x and 50x, and the rack-and-pinion focuser accepts any other 1.25" eyepieces and accessories adding to its versatile nature. An included 45° erect-image diagonal corrects images horizontally and vertically when using the OTA as a spotting scope. The scope is offered without a mount or tripod, but an included Vixen-style dovetail plate makes it compatible with any alt-az or equatorial mount with a Vixen-style saddle.

Optical Performance
  • 90mm objective lens
  • 500mm focal length
  • Focal ratio: f/5.6
  • Doublet refractor-style optical design
  • Doublet achromatic lenses reduce chromatic and spherical aberrations for improved color rendition and without distortion across the entire field of view
  • Anti-reflection fully multicoated optics reduce light loss
  • Resolution power: 1.29 arc sec
  • Two-speed 1.25" rack-and-pinion focuser
Included Accessories
  • Eyepieces:
    • 25mm eyepiece yields 20x power
    • 10mm eyepiece yields 50x power
  • Diagonal:
    • 45° viewing angle
    • Erect-image prism corrects image horizontally and vertically for terrestrial use
Mounting
  • Vixen-style dovetail plate included
  • User-supplied mount and tripod required
  • Compatible with any alt-az or equatorial mount with a Vixen-style saddle
In the Box
iOptron R90 90mm f/5.6 Doublet Refractor Telescope (OTA Only)
  • 25mm Eyepiece
  • 10mm Eyepiece
  • 45° Erect-Image Diagonal
  • Frong Dust Cap
  • Limited One-Year Warranty
  • Table of Contents
    • 1Description
    Optical Tube Assembly
    Optical Design Achromatic Doublet Refractor
    Aperture 90 mm / 3.5"
    Focal Length 500 mm
    Focal Ratio f/5.6
    Focuser Not Specified by Manufacturer
    Eyepiece Barrel Diameter 1.25"
    Diagonal Yes, 45 Erecting
    Finderscope No
    Mounting System Vixen Style
    Optical Tube Dimensions Not Specified by Manufacturer
    General
    Weight 4.0 lb / 1.9 kg
    Packaging Info
    Package Weight 4.85 lb
    Box Dimensions (LxWxH) 23.2 x 5.2 x 5.1"
    R90 90mm f/5.6 Doublet Refractor Telescope (OTA Only) is rated 2.5 out of 5 by 2.
    Rated 3 out of 5 by from Plasticy I have got my product and when opened it feels really like toy. It feels like plastic. The prism came with it- i have used once and replaced with my other older one. Tried to focus on Jupiter- was not possible---also a lots of Chromatic aberration. But , for this price we could not expect more except the focusing problem- should have been able to focus at least. This is the first time I have used iOptron product and this would be the last for long time. If you are looking for your first ever scope- Do NOT buy this- it will end your appetite for night sky observation.
    Date published: 2017-05-12
    Rated 2 out of 5 by from Description of the item is wrong and misleading The overview of this telescope says, and what I based my decision to buy upon vs. another simiolar scope, was this: �"• Two-speed 1.25" rack-and-pinion focuser" To my dismay, The focuser is NOT a two speed focuser! Very disappointed in this. Not sure if I can get a two-speed retro-fit.
    Date published: 2018-02-23
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