Explore Scientific 82 Degree 6.5mm Telescope Eyepiece - High Power

In this review the Explore Scientific 82 Degree 6.5mm eyepiece is judged as a high-power, purpose-built ocular for observers who want more detail on the Moon and planets while keeping comfort for eyeglass wearers. The single biggest reason to consider it is the combination of a short 6.5mm focal length for strong magnification and an unusually long 16.8mm eye relief that preserves a full field of view for those who wear glasses. The waterproof, gas-purged housing and multi-coated low-dispersion optics make it a reliable choice for serious backyard use.

Key Features

• 6.5mm focal length: Delivers higher magnification ideal for planetary and lunar detail under steady skies.
• 16.8mm eye relief: Provides comfortable viewing for eyeglass wearers while still showing the full apparent field.
• 82 degree apparent field of view: Makes it easier to locate targets and explore extended regions like nebulae with relaxed eye positioning.
• Low-dispersion, edge-blackened glass: Maximizes contrast and sharpness for high resolution views with reduced internal reflections.
• Enhanced multi-layer coatings (EMD): Improve light transmission so faint details and contrast are preserved at higher magnifications.
• Waterproof, gas-purged housing: Prevents internal moisture and dust, increasing durability and reliability in varying conditions.

Who It's For

The eyepiece is best for intermediate and advanced amateur astronomers who already own a telescope capable of handling higher magnification and want to push for sharper planetary and lunar detail. Observers who wear glasses will particularly appreciate the 16.8mm eye relief that allows a full field of view without sacrificing the higher power.

This is not aimed at beginners who need low-power, wide-field eyepieces for general sky sweeps, nor for those with small-aperture scopes that struggle with high magnifications. If your local seeing is consistently poor, the higher power may be unusable much of the time.

Pros & Cons

Pros

• High magnification for detailed planetary and lunar observing.
• Long eye relief that accommodates eyeglass wearers while delivering a wide apparent field.
• Waterproof, gas-purged housing reduces internal contamination and moisture issues.
• EMD coatings and low-dispersion glass yield crisp contrast and sharpness.

Cons

• High power means performance is dependent on stable atmospheric seeing; not ideal for poor conditions.
• The very wide apparent field and coatings add complexity that may be unnecessary for casual observers seeking simple, low-power views.

Specifications

Brand	Explore Scientific
Focal length	6.5mm
Apparent field	82 degrees
Eye relief	16.8mm
Optical design	Low-dispersion glass with edge-blackened elements
Coatings	Enhanced multi-layer deposition (EMD)
Housing	Waterproof, inert gas purged with O-ring seal

Our Verdict

The Explore Scientific 82 Degree 6.5mm eyepiece is a strong choice for observers who need higher magnification with comfortable eye relief. Its combination of sharp, high-contrast optics, generous apparent field, and waterproof housing make it a durable, practical upgrade for planetary and lunar work, offering solid value for those who can use the increased power in good seeing.

Frequently Asked Questions

Will this eyepiece work for eyeglass wearers?
Yes, the 16.8mm eye relief is long enough to allow eyeglass wearers to see the full apparent field comfortably.

Is the eyepiece weather resistant?
Yes, the housing is gas purged and O-ring sealed to be waterproof and resist internal moisture and dust.

Is this eyepiece suitable for deep sky wide field views?
Not primarily; the 6.5mm focal length provides high magnification better suited to planets and the Moon rather than expansive deep sky sweeps.