Explore Scientific - 24mm 68° Series Argon-Purged Waterproof Eyepiece - 1.25"

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Explore 68° Series Eyepieces are optimized through each design, fabrication, and testing process to produce high contrast, high resolution images.

SKU: EXP-EPWP6824-01
Manufactured by:
Explore Scientific

Product Description

Explore Scientific 24mm 68° Waterproof Eyepiece - 1.25"


Longer Eye Relief with a Pleasing Field of View

There are several things to consider when contemplating the purchase of a new Explore Scientific eyepiece, and customers often ask for our help when they are pondering choices in focal length, field of view, and eye relief. We can certainly help narrow the field, so to speak, by asking some targeted questions, but when it comes right down to it, choosing the "perfect" eyepiece from that point on is all about personal preference.

To some, the most important feature of an eyepiece (besides a sharp, clear image!) is a wide field of view, while to others, long eye relief is #1 on their "must have" list. And to make things even more complicated, prerequisites for an eyepiece used mainly for lunar and planetary viewing are usually different than those required for huge objects like galaxies and nebulae. That is why Explore Scientific offers a wide variety of eyepiece designs; so that you can pick the features you require and desire, whether you are investigating the deepest reaches of space, the Great Red Spot on Jupiter, or migrating whales just off the coast of California.

The Explore Scientific 68° Series Eyepieces were designed for those who prefer longer eye relief but still want to enjoy a field of view that is wider than a classic Plossl or Orthoscopic style eyepiece. If you wear eyeglasses and either want or need to keep them on while observing, the extra long eye relief built into the 68° models will allow you to do that and still observe comfortably. As you can see from the chart shown above, the eye relief in this series starts at almost 12mm on the 16mm model and increases quickly until it reaches a maximum of 31mm on the 40mm model. There are four Explore Scientific 68° eyepieces…the 24mm, 28mm, 34mm, and 40mm…that sport an eye relief of over 18mm, which is perfect for eyeglass wearers. If you wish to increase the magnification of these eyepieces while still maintaining their superb eye relief, use them with the appropriate Explore Scientific Focal Extender, which comes in both 1.25" and 2" barrel sizes.

Of course, you do not have to wear eyeglasses to appreciate comfortable eye relief, or the quality that lives in each Explore Scientific 68° eyepiece. From the rubber grip and folding eyecup to the enhanced EMD coatings for superb contrast, we think you'll agree that these eyepieces are a perfect solution for dropping the power down on your telescope, which will increase the exit pupil size and allow you to see the faintest objects that your telescope is capable of.


Explore Scientific 68° Eyepiece Highlights

Optimized Optical Design - Explore 68° Series Eyepieces are optimized through each design, fabrication, and testing process to produce high contrast, high resolution images.

Durable Coatings & Finishing Touches - Each element in your Explore Scientific 68° eyepiece is fully multi-coated, resulting in bright, sharp images, and every element has blackened edges to reduce internal reflections and increase contrast.

Waterproof, Fog-Proof Housing - The internal optics of all 68° Series eyepieces are housed in a gas-purged, waterproof barrel that keeps them as pristine as the day they were manufactured. Cleaning is much easier, and there is no need to worry about water or fluid becoming trapped in between elements due to rain, spills, heavy dew, or getting over-enthusiastic with lens cleaning fluid.

Tapered Barrel for Extra Security - The insert barrel of each eyepiece is double-tapered to allow smooth insertion to, and removal from, a telescope's eyepiece holder or diagonal, however the wide dimension of the taper helps prevent the eyepiece from falling out of the telescope should the set-screw holding it in place become loose. Barrels are threaded to accept standard screw-on filters.

Optional Focal Extenders for Extra Magnification - Explore Scientific makes a wide variety of eyepiece focal lengths, allowing a change in magnification for just about any observational study you can think of. However, if you would like to get "double duty" out of the eyepieces in your accessory case, while still retaining the eye relief of that eyepiece, use Explore Scientific Focal Extenders.



Name Explore Scientific - 24mm 68° Series Argon-Purged Waterproof Eyepiece - 1.25"
Manufacturer Explore Scientific
UPC 812257010523
Model EXP-EPWP6824-01
Manufacturer Part # EXP-EPWP6824-01
Apparent Field of View 68°
Eye Relief 18.4mm
Eyepiece Barrel Size 1.25
Field Stop Diameter 27.2mm
Focal Length 24mm
Warranty Explore Scientific STAR Lifetime Warranty (click to read more)


Review and collect 50 points.
Review by:
I cannot say enough good things about this eyepiece. The quality is superb, and viewing through it is a pleasure. I use mine in an 8" Orion Dobsonian with great results. While cruising through the heavens, I stumbled upon M57, the Ring Nebula and had never expected to find it before. I never noticed it before in either a 30mm or 38mm eyepiece but the 24mm had just the right magnification to spot it. Wonderful on the double-cluster and many other Deep Sky objects. I highly recommend this eyepiece. (Posted on 11/24/2015)
Review by:
For years I have been basically using Plossels in my NexStar 9.25” GPS scope and have been satisfied, but understand there are alternatives that could enhance my viewing experience. Plossels provide edge-to-edge sharpness, but have a relatively limited apparent FOV. My F10 scope won’t benefit from exceptionally wide FOV oculars (82°, 100°, 360°), but 68° felt like a “sweet spot.”

One of my motivations to move to wider field was driven by my advancing age. Transporting my scope to outreach events and observing sessions under dark skies will become a challenge eventually, and a short focal length refractor will probably replace my beloved 9.25”. Factor-in a fast scope would challenge the performance of the Plossel design and the search began for make-sense replacements.

Characteristics of import while performing my due diligence included attractive price points, off-axis performance, and feedback from the masses that took time to post the reviews that reflect actual experience versus marketing hype. I chose Explore Scientific and purchased the 34mm, 24mm, and 16mm 68° eyepieces.

Virtually all of my personal observing is focused on DSOs, and I find I now keep the 24mm ocular in the diagonal 98% of the time. The views through it have been extraordinary and I couldn’t be more pleased. The increase in FOV provides a heightened experience, and the new detail revealed in objects astounds me. Too, the 24mm and 16mm take Barlowed power really well.

From a purely subjective perspective, the ES eyepieces look gorgeous on the scope.

To net out this review: a friend, fellow astronomy club member, and published astronomy writer, after viewing multiple targets through the 24mm proclaimed: “don’t ever sell this eyepiece.” This is a most qualified appraisal, advice that I will surely take.

Disclaimer: my affiliation with Explore Scientific is limited to being a customer.

Bob Christ, Phoenix, AZ

(Posted on 6/11/2013)
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