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Orion Telescopes
17mm Type 4 Tele Vue Nagler Telescope Eyepiece
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Expected Ship Date: 10/10/2020

  • Looking through a 2" Nagler 17mm telescope eyepiece is like taking a spacewalk
  • The 82deg apparent field of view seems almost boundless: you have to move your eye around to take in the entire scene
  • 17mm focal length eyepiece is great for medium magnification views of virtually any celestial subject
  • The exquisite sharpness, contrast, and comfort - in addition to the monster AFOV - makes this Nagler the eyepiece of choice for advanced amateur and professional astronomers
  • Weight: 1.6 lbs

Learn more
Item #  08359
Mfg Model #  EN4-17.0

Looking through a Nagler eyepiece is like taking a spacewalk. That?s because the 82° apparent field of view seems almost boundless: you have to move your eye around to take in the entire scene. The exquisite sharpness, contrast, and comfort ? in addition to the monster AFOV ? make Naglers the eyepieces of choice for advanced amateur and professional astronomers.

Available in a wide range of focal lengths and "Types", Nagler eyepieces belong in the equipment arsenal of every serious planetary and deep-sky observer.

Nagler eyepieces don?t all look alike! In fact, there are several different "Types," which differ considerably in shape, size, and optical characteristics.

Nagler Type 4Nagler Type 4
Applying the experience of the Radian development to the 82° Nagler series yielded more contrast, reduced pincushion distortion, more true field, longer eye relief, and fewer elements to achieve focal lengths of 12mm, 17mm, and 22mm. With added eye-relief, the click-stop Instadjust eyeguard helps maintain proper eye distance and centration. For deep-sky viewing, the comfort, clarity and contrast gets us closer to the "spacewalk" viewing goal.

Nagler Type 5Nagler Type 5
With the 31mm, the unique 6-element design, using four exotic glasses, maintains the contrast advancement of the Type 4s while achieving a true field area 82% larger than the 22mm Type 4! Owners of fast Dobsonian/Newtonians can enjoy a larger true field, free of secondary shadowing, than ever before. For example, a 12.5", f/4.5 scope with a Paracorr will deliver a 1.5-degree field (3 Moon diameters), at 53x with a 6mm exit pupil.

The 16mm Nagler Type 5 is a scaled down version of the "king of the field" 31mm. The new 16mm is a smaller, lighter (0.45 lbs.), 1.25" only, 6-element design. This exciting little high contrast eyepiece looks like a 19mm Panoptic, but packs the visual impact and sharpness we all expect from the 82° Nagler series. This eyepiece offers owners of 1.25"-only scopes the largest possible true field in an 82°apparent field eyepiece. Great for small scopes and binocular viewers.

26mm Nagler Type 5: This is a somewhat smaller, lighter, and more powerful version of the celebrated 31mm Nagler Type 5. It weighs about 1.6 lbs. and has a field stop diameter of 35mm. It is parfocal with the 17mm Nagler Type 4, making it a nice match in size, weight, and convenience.

The 20mm Type 5 is a compact 1-lb., 2" eyepiece that fills out the eyepiece line and is a worthy successor to the heaviest commercial eyepiece ever produced: the Nagler 20mm Type 2, which weighed in at 2.3 lbs. when introduced in 1986!

Nagler Type 6Nagler Type 6
The 7-element Nagler Type 6 design is based on the original patented Nagler design. This new 7-element design update for the short focal length Nagler deserves its own designation. Using different exotic materials, coating processes, and design ingenuity, Al has massaged more eye-relief, contrast, and true field of view into the shorter focal length Naglers, while maintaining the absolute sharpness of the originals. Eye relief is 12mm on each model, and all are sized about the same as the original 7mm! Each weighs from 0.4 to 0.5 lbs. Available in 13mm, 11mm, 9mm, 5mm, 3.5, and 2.5mm focal lengths.

In recognition of the cost increase of the new 7mm and 5mm models over the originals, we intend to continue offering the original 7mm and 4.8mm Naglers. NOTE: The goal we set designing these new eyepieces was to increase contrast, maintain or increase eye-relief, reduce size and weight, and maintain the sharpness of the originals. They are all parfocal.

NaglersThe 11mm Nagler Type 6 slots in perfectly between the 13mm and 9mm Type 6s and makes a perfect companion to the 7mm.

The 3.5mm Nagler Type 6 is a natural progression of 1.4x power steps from 7mm and 5mm Naglers. The 2.5 is also a 1.4x step from the 3.5mm. You don?t have to sacrifice field in order to gain sharpness and power. And, you?re not limited to slow scopes, or have to squint through pinhead lenses. These are the lunar and "planetary" eyepieces with field to spare.


This product is serviced and supported by its manufacturer according to the terms and conditions included in the packaged product. Orion's limited warranty does not apply. Please contact the manufacturer directly for technical support.


Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.

  • Design
  • Eyepiece focal length
  • Barrel size
  • Apparent field of view
  • Eye relief
  • Coatings
    Fully multi-coated
  • Number of elements
  • Filter threads
  • Parfocal
  • Field stop diameter
  • Barrel security recess
  • Blackened lens edges
  • Rubber eyeguards
  • Body material
  • Case
  • Weight (oz.)
  • Additional included accessories
  • Other features
  • Warranty
    Limited lifetime

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.

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