Cloud Break Optics

52° 25mm Waterproof Eyepiece (EPWP5225-01)

52° 25mm Waterproof Eyepiece (EPWP5225-01) - Main image
$51.99 $79.99 In stock

Category: Eyepieces

Description

Long considered the “standard” eyepiece that is often supplied with telescopes that are sold by various suppliers, the 25mm focal length category is perhaps the most used eyepiece in the world. Like the 20mm, these eyepieces are great for binoviewer devices, and the 25mm is probably the longest focal length of the mid-power range eyepieces before you get into longer focal lengths.

Explore Scientific Waterproof Eyepieces - Comfort, Quality, Value. The Explore Scientific 52° Series eyepieces are excellent flat-field multi-element oculars that can transform your visual astronomy experience. With an apparent field of view of 52 degrees, these eyepieces offer incredible value in a very nice eyepiece. Expect exceptional quality, eye relief and value versus a comparably priced Plossl.

Another great benefit of these eyepieces is the excellent contrast and ease with which you can gaze, not directly at an object, but slightly to either side. This skill, called using averted vision, is especially helpful when observing faint objects, because using averted vision puts the image on a part of your eye that is more sensitive to light, allowing you to see fainter images.

Specifications

Item Number EPWP5225–01
Focal Length 25mm
Length 67.7mm
Width 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

Limited USA One Year Warranty when product is registered within 60 days of purchase. Click Here to register.

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Customer Reviews (5.0 / 5 · 5 reviews)

Samuel G. ★★★★★

I was worried about fogging on humid nights, but this eyepiece's waterproofing has been a lifesaver for my backyard viewing. The 25mm focal length gives a nice, wide field for scanning the moon. It fits securely in my focuser and the image stays crisp.

Timothy C. ★★★★★

The rubber grip around the barrel makes it easy to keep a steady hold even when my fingers are cold. Focus snaps into place cleanly, and the view is crisp out to the edge. A solid upgrade from the basic eyepiece that came with my scope.

Olivia W. ★★★★★

The 25mm focal length is exactly what I needed for crisp views of the moon, and the waterproof build gives me peace of mind during dewy nights. Focus adjustment is smooth and precise.