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 61 of 100 
Orion Telescopes
40mm Explore Scientific 68-degree WP Telescope Eyepiece
$519.99
 
Accepted Payment
Standard Per-Item Shipping Charge: $5.00
More Shipping Information
Expected Ship Date: 01/10/2025

  • 68-deg Apparent Field of View
  • 40mm Focal Length, 2" barrel
  • Waterproof Eyepiece
  • Unlimited Lifetime, Transferable Warranty
  • 31mm of eye relief


Learn more
Item #  54082
Mfg Model #  EPWP6840-01

Using advanced computer design, combinations of low dispersion and high refractive index optical glasses, and durable multilayer deposition coatings, Explore Scientific 68-deg Series(tm) Argon-Purged Waterproof extreme wide field eyepieces are optimized to produce high contrast, high resolution, and superior flat field characteristics. The visual effect of these eyepieces with their long eye-relief and their 68-deg apparent field is truly a full-immersion experience. The 68-deg Series eyepieces come with a removeable and foldable soft silicone rubber eyecup for the comfort of the observer, and as experienced astronomers know, eye comfort is critical when trying to observe at the visual limits of the telescope.

Protection from the Outdoors - By making the eyepiece body Argon-purged, the waterproof eyepiece internal elements will remain as pristine as the day they were assembled. Argon atoms are "larger" than that of Nitrogen and therefore they are less likely to "leak" or diffuse their way through the seals over the life of the eyepiece. The atomic radius of Argon is larger than Nitrogen by 0.13 angstroms and has a larger atomic volume by 11.2 cubic centimeters/molecule. Argon also has superior inertness vs Nitrogen that prevents adverse reactions with eyepiece components and therefore extends the longevity of the internal components, and also prevents chemical reactions with other elemental contaminants that may be introduced through a weakened seal. And, finally because Argon is less conductive of heat than Nitrogen, Argon cools slower thereby buffering the effects of rapid temperature changes of the optics.

The sealed, dry environment is impervious to internal fogging and contaminants such as fungus growing in between the lens elements. Our waterproof eyepiece is easier to clean, and there is no risk of cleaning solution migrating from the top of the lens and seeping around edges to be trapped in between elements.

Warranty

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.

Warning

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

  • Design
    Proprietary
  • Eyepiece focal length
    40.0mm
  • Barrel size
    2"
  • Eye relief
    31.0mm
  • Coatings
    Fully multi-coated
  • Number of elements
    6
  • Filter threads
    Yes
  • Parfocal
    No
  • Barrel security recess
    Yes
  • Blackened lens edges
    Yes
  • Rubber eyeguards
    Yes
  • Body material
    Aluminum
  • Case
    No
  • Weight (oz.)
    35
  • Dimensions
    4.5 in. x 3.2 in.
  • Additional included accessories
  • Other features
  • Warranty
    One year

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.

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

Standard Delivery: $5.00

SHIPPING RESTRICTIONS APPLY FOR THIS PRODUCT

This product is available to ship Standard delivery within the 50 US states. Delivery is not available to APO/DPO/FPO addresses, US territories/protectorates or Canada. 3 Day, 2nd Day and Next Day delivery is not available.

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