Explore Scientific 52° Series 25mm Waterproof Eyepiece

The Explore Scientific 52° Series 25mm Waterproof Eyepiece is the line's standard-focal-length eyepiece — the 25mm length that's most commonly supplied with telescopes and widely used across the hobby.

• Field of View: 52° apparent field of view with a flat-field, multi-element optical design.
• Focal Length: 25mm focal length, item number EPWP5225-01.
• Use Case: A 25mm focal length is one of the most commonly used eyepiece lengths, well suited to binoviewer setups and general observing.
• Dimensions: 67.7mm long, 43mm wide, and weighs 181.4 grams (6.4 oz).
• Elements: 4 optical elements in 2 groups, edge blackened.
• Coatings: EMD (Enhanced Multi-Layer Deposition) coating on all lens-to-air surfaces, with edge-blackened elements for contrast.
• Waterproofing: O-ring sealed and argon gas purged, tested under 1 meter of water for 30 minutes.
• Eyecup: Removable flip-down soft silicone eyecup with slide-on top and bottom lens caps.
• Barrel & Fit: 1.25" O.D. double-taper barrel that fits standard 1.25-inch filter threads (1.125" x 42 TPI).
• Warranty: Covered by a limited USA one-year warranty when the eyepiece is registered within 60 days of purchase.