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Explore Scientific 52° Series 25mm Waterproof Eyepiece

SKU EPWP5225-01
Original price $0.00 - Original price $0.00
Original price $0.00
$129.99 - $129.99
Current price $129.99
In stock

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Explore Scientific 52 Degree Series 25mm Waterproof Eyepiece - EPWP5225-01

Introducing the Explore Scientific 52° Series 25mm Waterproof Eyepiece, a stalwart in the realm of standard eyepieces often included with telescopes from various suppliers.

The 25mm focal length stands as a cornerstone in eyepiece utility worldwide, widely favored for its versatility.

Much like its 20mm counterpart, this eyepiece excels with binoviewer devices, making it one of the longest focal lengths within the mid-power range before venturing into lengthier options.

The Explore Scientific 52° Series 25mm Waterproof Eyepiece redefine visual astronomy with a trifecta of comfort, quality, and value.

These flat-field, multi-element oculars elevate your astronomical experiences.

Boasting a generous 52-degree apparent field of view, they offer an exceptional fusion of quality and affordability, outshining comparably priced Plossls.

These eyepieces also excel in providing superior contrast and ease of observation, particularly when employing a technique known as averted vision.

This skill allows for a sidelong gaze, rather than a direct focus on the object.

Particularly beneficial for discerning faint celestial objects, averted vision directs the image to a more light-sensitive part of the eye, enhancing the visibility of even the faintest details.



  • 52° Apparent Field of View: Immerse yourself in an expansive 52-degree apparent field of view, capturing a vast celestial vista with a single glance. This immersive vantage point elevates the observation of celestial objects, providing a comprehensive and visually stimulating experience.
  • 25mm Focal Length: Striking a harmonious balance between versatility and precision, the 25mm focal length offers an optimal level of magnification for a wide spectrum of astronomical observations. It provides a comfortable view of extended celestial objects such as star clusters and galaxies, while also revealing intricate details of planets and lunar features.
  • EMD (Enhanced Multi-Layer Deposition): The Explore Scientific 52° Series Eyepiece is fortified with EMD coatings, embodying Enhanced Multi-Layer Deposition. This specialized coating process heightens light transmission and minimizes internal reflections, resulting in images that are crisper, with heightened contrast and enhanced color accuracy.
  • Waterproof - O-Ring Sealed Argon Gas Purged: Engineered to withstand the elements, this eyepiece features a robust waterproof design. It is fortified with O-ring seals, creating a secure, moisture-resistant barrier against water, dust, and debris. Moreover, it is infused with argon gas, further reinforcing its resistance to internal fogging and moisture-related damage.
  • Rigorous Water Testing: Subjected to meticulous evaluation for waterproof proficiency, this eyepiece endured a 30-minute submersion under one meter of water without any compromise in performance. This certification attests to its suitability for various weather conditions, including damp or rainy environments.
  • Removable Flip-Down Style Soft Silicone Rubber Eyecup: Equipped with a detachable flip-down style soft silicone rubber eyecup, this eyepiece ensures comfort and effectively shields against stray light, enhancing the overall viewing experience. Additionally, its removable design allows for customization based on the observer's preferences.
  • Edge Blackened: Showcasing edge-blackened optics, this eyepiece undergoes a process that darkens the edges of the lens to reduce internal reflections and intensify contrast. This refinement minimizes stray light, resulting in superior image quality, especially in scenarios with pronounced contrasts between bright and dark areas.
  • High-Quality Optics: Meticulously crafted with precision, this eyepiece hosts top-tier optics engineered to deliver exceptional views of celestial objects. The lenses adhere to stringent standards, with their optical surfaces meticulously polished to minimize aberrations and maximize light transmission.
  • Durable Construction: Engineered for resilience, this eyepiece embodies robust construction capable of withstanding the rigors of outdoor use. Its sturdiness ensures it can endure transportation, handling, and exposure to diverse environmental conditions, all without compromising its optical performance.
  • Threaded Barrels for Filters: Equipped with threaded barrels, this eyepiece empowers users to attach standard astronomical filters. This functionality allows for the customization of the viewing experience, enabling the enhancement of specific colors or the reduction of light pollution in accordance with the observer's preferences and target object.
  • Comfortable Eye Relief: Providing ample eye relief, this eyepiece facilitates extended periods of observation without inducing eye strain. This feature is particularly valuable for eyeglass wearers, ensuring they can maintain a full field of view without the need to remove their glasses.
  • Included Accessories: The accessory ensemble accompanying the Explore Scientific 52° Series 25mm Waterproof Eyepiece includes protective eyepiece caps, comfortable soft silicone rubber eyecups, a secure eyepiece pouch/case for storage, and is complemented by a limited 1-year warranty, providing users with enhanced peace of mind.

                                                                        Explore Scientific 52° Series Eyepieces Highlight Video:

                                                                        Explore Scientific Eyepiece Guide Video:


                                                                        What's Included:

                                                                        ✓ Explore Scientific 52° Series 25mm Waterproof Eyepiece

                                                                        ✓ Eyepiece Caps

                                                                        ✓ Soft Silicone Rubber Eyecups

                                                                        ✓ Eyepiece Pouch/Case

                                                                        ✓ Limited 1 year warranty



                                                                        Item Number  EPWP5225–01
                                                                        Focal Length  25mm
                                                                        Length  67.7mm
                                                                        Weight  43mm
                                                                        Weight  181.4 grams; 6.4 oz.
                                                                        Barrel Size/Type  1.25" O.D. / Double Taper
                                                                        Eye Relief  16.4mm
                                                                        Field Stop Diameter  18.2mm
                                                                        Coatings  EMD (Enhanced Multi-Layer Deposition) on all lens-to-air surfaces
                                                                        Lens Elements/ Groups  4 Elements in 2 Groups; Edge Blackened
                                                                        Filter Thread  Fits Standard 1.25-inch Dia. Thread in Filters (1.125-inches x 42 TPI)
                                                                        Waterproof  O-Ring Sealed Argon Gas Purged; Tested Under 1 Meter of Water for 30 Minutes
                                                                        Eyecup  Removable Flip-Down Style Soft Silicone Rubber
                                                                        Lens Caps  Slide-on Top and Bottom
                                                                        Materials  Optical Glass; Aluminum; Steel; Silicone Rubber
                                                                        Markings  Laser Engraved: Focal Length; Series; Serial Number; Brand

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