Explore Scientific 82° 6.5mm LER Waterproof Eyepiece - 1.25"

The 6.5mm Focal Length: High-Power Views with an 82° Field

With a 6.5mm focal length, this eyepiece is a specialist for high-power observation. It excels at revealing details on the Moon's surface, the cloud bands of Jupiter, and the rings of Saturn. The trade-off for this high magnification is a greater sensitivity to atmospheric seeing; on nights of excellent stability, this eyepiece can reveal stunning planetary detail and resolve the core structures of bright nebulae and globular clusters.

• Immersive Views: The ultra-wide 82° apparent field of view creates a spacewalk-like experience, allowing you to use averted vision more effectively to detect faint details that might be missed in a narrower field.
• High-Contrast Optics: The design uses low-dispersion glass with a high refractive index, with all lenses fully multi-coated with Enhanced Multi-Layer Deposition (EMD) coatings and edge-blackened to maximize contrast and light transmission.

16.8mm Long Eye Relief: Critical Comfort for Eyeglass Wearers

A standout feature of this eyepiece is its 16.8mm of eye relief, a critical specification for observers who wear glasses to correct for astigmatism. Unlike many high-power eyepieces that require you to press your eye against the lens, the long eye relief allows you to see the entire 82° field of view comfortably with your glasses on. This relaxed viewing posture reduces eye strain, enabling longer, more detailed observing sessions.

Argon-Purged & Waterproof: A Sealed Optical System for All Conditions

Explore Scientific's LER eyepieces are built to withstand the elements. The optical housing is O-ring sealed and purged with inert argon gas, making it completely waterproof. This process prevents internal fogging when moving the eyepiece from a warm environment to cold outdoor temperatures and protects the internal coatings from moisture, fungus, and dust for the life of the eyepiece. This robust construction also makes cleaning the external surfaces simple and safe.

Choosing Your Focal Length: The 6.5mm in the 82° LER Series

Selecting the right high-power eyepiece depends on your telescope and typical seeing conditions. Within the Explore Scientific 82° series, the 6.5mm model occupies a versatile sweet spot.

• Higher Power: Compared to an 11mm or 14mm eyepiece in the series, the 6.5mm provides significantly more magnification, making it the superior choice for planetary observing and resolving close double stars.
• Seeing-Dependent: A shorter focal length, like a 4.7mm, would offer even higher magnification but would be usable on far fewer nights due to atmospheric turbulence. The 6.5mm provides a powerful view that remains practical under average-to-good seeing conditions for most locations.