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Explore Scientific 14mm 100 Degree Eyepiece - 2"

SKU : ES-EPWP10014-01

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  • AFOV: 100-degrees
  • Focal Length: 14 mm
  • Eye Relief: 14.5 mm
  • 2" Barrel


Product Details

  • The 14 mm 100-Degree Eyepiece - 2" by Explore Scientific:


    The development of the Explore Scientific 14 mm 100-degree Series Argon-Purged Waterproof Eyepiece was a collaborative effort of astronomers and engineers who tested our prototypes again and again, in the field and in the factory to make refinements to produce the final production eyepiece.

    Inspiration for ultra-wide field eyepiece designs came from several designers. Wright H. Scidmore patented important ultra-wide angle eyepiece designs (one with long eye-relief) in the 60s for the U.S. government. His influence can be seen in many eyepiece designs on the market today with eyepieces of 68 to 80-degrees apparent field and more. Carl Zeiss made eyepieces of 110 and 120-degrees apparent field for use in U-boat periscopes before World War II. These are but two notable designers who developed ultra-wide field eyepieces over the decades.

    Like all Explore Scientific eyepieces, the lens elements of the 100-degree eyepiece are meticulously cleaned and aligned before being installed in their precision machined lens barrels.

    Each lens and lens grouping have EMD (Enhanced Multi-layer Deposition) Coatings and are edge-blackened to eliminate light scatter and maintain image contrast.

    Contrast is further enhanced with baffles that mask and deflect unwanted stray light.

    These eyepieces with their huge apparent field of view not only gave the observer a panoramic visual experience, but they relax the eye so the observer could pay attention to subtle details for extended periods. These ultra-wide angle eyepieces played a critical role in the military for aiming at targets, and their long eye-relief counterparts helped reduce eye injury from recoil.

    To make sure, every 100-degree eyepiece is tested by submerging them down to 1 meter of water for 30 minutes.

    Years later such eyepiece designs transformed the visual experience for amateur astronomers, as they started using military surplus cannon sight eyepieces on their backyard telescopes. Al Nagler with his company Tele Vue introduced his Nagler 82-Degree eyepieces (and later introduced the 100-degree Ethos eyepieces), and then other commercial telescope companies such as Meade Instruments, Pentax, Celestron, and others made ultra-wide field eyepieces specifically for use in amateur telescopes. Since extreme performance eyepieces are expensive to make, they come with a relatively high price tag over standard eyepieces.

    After announcing Explore Scientific's line of telescopes at the Astronomical League Conference in the summer of 2008, we decided to focus on extreme performance, ultra-wide angle eyepiece designs as well. We wanted to offer ultra-wide angle designs in popular formats at lower prices. Now more astronomers could experience the benefits of the amazing panoramic views these eyepieces provide.

    Each and every Explore Scientific eyepiece is inspected both at the factory and again at our USA facility in California.

    Here we are making final visual and cosmetic inspections where we check for assembly integrity, cleanliness, and optical performance (including a test for visual image edge consistency) before shipping them to our customers.

    Developing our new eyepieces we wanted to take a fresh perspective and address several points. Our goal was to produce an ultra-wide angle design that provides pride of ownership at a great value:

    Focus on Value - We invite direct comparison to any eyepieces on the market in their category.

    Protection from the Outdoors - By making the eyepiece body Argon-purged and waterproof eyepiece internal elements will remain as pristine as the day they were assembled. 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. To insure a perfect seal we test every eyepiece in one meter of water for 30 minutes.

    Creating an Identity - We look at purchasing fine optical equipment as an investment, and it should be treated as such. With a unique serial number on each eyepiece we can track when a product was made, and the owner can document their equipment for insurance and warranty purposes.

    Explore Scientific 14 mm 100-degree Eyepiece Specifications:
    • AFOV: 100-degrees
    • Eye Relief: 14.5 mm
    • Waterproof: Submersible to 1 meter for 30 minutes
    • Coatings: All lens-to-air surfaces are full multi-coated
    • Barrel: 2" diameter, tapered barrel-style, accepts 2"  diameter standard filters
    • Eye cup: Soft rubber folding style; Replaceable
    • Weight: 1-pound 14-oounce


    OPT Product Number: ES-EPWP10014-01

  • specifications

    Dust Caps IncludedYes
    Eye Guard IncludedYes
    Eye Relief14.5m
    Field of View100 degrees
    Focal Length14mm
    WarrantyLifetime Warranty
  • included items

    • Explore Scientific 14 mm 100-degree Eyepiece


Product Reviews

Customer Reviews
5.0 Based on 8 Reviews
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Filter Reviews:
    Jimme E.
    United States

    Bigger is better

    I like it! I am a fledgling astronomer, so my input is questionable, but I like big optics, so for the money ES rocks.

    Jeff D.
    United States

    The moon with explor 14mm 100 degree

    Used on a 15” f/4.5 obsession the entire moon was visible through the eyepiece. The details were outstanding from the center to the very outside edge. Oh yes the Orion Nebula wow. Thanks opt for your recommendation.


    A great eyepiece for the money

    I don't have a ton of eyepieces but I have observed with some of the best mass production eyepieces there are. This was my first step into the world of $100+ eyepieces and it was a great choice. The FoV, eye relief and edge to edge sharpness is fantastic. Many in my astronomy club have complimented it as well. I'm going to get the 20mm next, this eyepiece has sold me on sticking with Explore Scientific.


    Great Eyepiece

    It really is comparable to the Ethos line. The only downside is the weight of the EP. It is significantly heavier. Under challenging conditions for an EP (F4.5 and lower) it performs as well as the Ethos. Using a coma corrector, the 14mm ES 100 is very sharp at the edge of field in my 16" F4.5 Dob. It may even be better than my astronomy club's Ethos 13mm. Without a coma corrector it is ok at the edge.



    This eyepiece is a real winner. Excellent sharpness & contrast. Comfortable to use. Edge performance is very good in my f/4.5 Newts (without a coma corrector. The 100 deg field, while not quite perfect at the very edge, really makes you feel like you're there. I'm hooked, and will be getting the 9mm ES 100 deg as soon as I can get the funding in place. There are exactly 4 potential downsides that I can see to this eyepiece: 1 price (which is actually relatively low compared to a similar Ethos, 2 size/weight, 3 eyeglass compatibility (I would only see ~75 degrees with my glasses on, but fortunately my astigmatism is mild enough that I don't need to wear them with the 14mm like I do with my 30mm eyepieces, and 4 after using these, your 80 degree eyepieces that used to seem so amazingly wide will now seem claustrophobic by comparison.


    I love this eyepiece

    I started with the 14mm eyepiece, and love the 9mm too. With my next pay check I will complete the set (20mm. Observing is great when three eyepieces cover 90% of your needs. The view through my 16 Dob is awesome.