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Orion Telescopes
Orion GiantView ED 20x100 Waterproof Astronomy Binoculars
3 easy payments of $333.33
With payment plan
Accepted Payment
In Stock
  • Massive 100mm ED (extra-low dispersion) objective lenses, coupled with 20x magnification
  • 5mm exit pupil (100mm/20x) provides a brighter image on extended deep-sky objects compared with a 25x100 binocular
  • Fully multi-coated optics and BAK-4 prisms coupled with well baffled interiors provide extremely high contrast and sharp images
  • Long 20mm eye relief lets eyeglass wearers see an unrestricted field of view without removing their corrective lenses
  • Weighs 9.2 lbs and features a rubberized exterior for a comfortable and solid grip

Learn more
Item #  51442

Based on the popularity and success of our smaller 80mm ED GiantView binoculars, we wanted to develop something even larger and more impressive. The Orion GiantView ED 20x100 Waterproof Astronomy Binoculars are the fruits of that labor! Massive 100mm fully multi-coated lenses pull in faint light from the night sky, and the ED (extra-low dispersion) glass lenses produce a high contrast and tact sharp image with minimal false color. Scanning the Milky Way to discovering hidden gems is what these binoculars were built for! But of course, they are also excellent for long distance daytime viewing as well.

20x magnification eyepieces really help to pull in distant targets, and with a 5mm exit pupil you can see a brighter view of extended objects in the night sky (such as nebulae and galaxies) compared with a similar aperture binoculars with only a 4mm exit pupil. Having that larger exit pupil really helps optimize these binoculars for deep-sky viewing!

An eye-relief of 20mm means even if you wear glasses, you'll be able to see the entire 3.3 field of view without taking those glasses off. BaK-4 prisms and internal baffling help ensure top notch optical quality. And the all-metal binocular housing is rock solid, with a tripod pier mounting post and rod that also doubles as an objective lens cross-bridge to hold the optical elements solidly in place. Rubberized surface coverings provide a comfortable and non-slip grip.

The tripod mounting bar clamps to the central support rod and attaches securely to a standard photographic tripod. Note that these binoculars weigh 9.2 lbs., so a solid and well-made photo tripod or parallelogram mount is highly recommended! Includes lens caps, tripod pier adapter, and a hard carrying case with foam cutouts to securely protect your giant binocular.


Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-447-1001.

Product Support
Visit our product support section for instruction manuals and more
  • Best for viewing
    Brighter deep sky
  • User level
  • Magnification
  • Optical diameter
  • Field of view - angular
  • Field of view - linear
    174.3 ft./1000 yd
  • Apparent field of view
  • Eye relief
  • Exit pupil
  • Near focus
    118 ft.
  • Coatings
    Fully multi-coated
  • Prism
    BAK-4 Porro
  • Interpupillary distance range
    56mm - 74mm
  • Focus style
    Individual eyepiece focus
  • Waterproof
  • Tripod adaptable
  • Diopter adjustment
  • Weight
    9.2 lbs.
  • Height
    15.5 in.
  • Additional included accessories
    Pier style tripod mounting clamp, Lens caps, Hard carrying case
  • Other features
    Extra-low dispersion lenses, Individual eyepiece focus, Nitrogen purged
  • Warranty
    One year

GiantView ED 20x100 Binocular
Lens caps
Tripod adapter

Orders received by 1pm Eastern Standard Time for in-stock items ship the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

A per-item shipping charge (in addition to the standard shipping and handling charge) applies to this product due to its size and weight. This charge varies based on the shipping method.

Standard Delivery: $0.00
Standard Delivery to Canada: $30.00
3 Day Delivery: $65.00
2 Day Delivery: $65.00
Next Day Delivery: $78.00

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