Explore Scientific 62° Series 2" 40mm Waterproof Eyepiece

The 62° Series 40mm delivers the widest field of view in the series through a 2" barrel with Long Eye Relief. Argon-purged waterproof construction keeps it sealed and fog-proof, and EMD coatings cover every air-to-glass surface.

Key Features

• 2" barrel. It accommodates a 42.2mm field stop, the largest in the 62° Series. The barrel is stainless steel, with a conical security cutoff to help keep the eyepiece secure in the focuser.
• Long Eye Relief (LER) design. Relaxed, comfortable viewing even during long sessions, fully compatible with eyeglasses. At 28.2mm, the eye relief leaves room for glasses while you still see the whole field.
• Flat-field optics. Five elements in three groups, made of low-dispersion, high-refractive-index glass, keep the image sharp across the full field.
• Near parfocal. The 62° Series eyepieces come to focus at nearly the same point, so switching between them takes only a small focus adjustment.
• Argon-purged waterproof housing. Sealed and fog-proof. The O-ring seal also keeps dust, fungus and cleaning fluid from getting between the lenses, which makes the eyepiece easier to clean.
• EMD coatings. Enhanced Multi-Layer Deposition (EMD) coatings on all air-to-glass surfaces give high contrast and suppress reflections and ghost images. The lens edges are blackened for the same reason.
• 62° apparent field of view. The widest framing in the series.
• Fold-down eyecup. The silicone rubber eyecup folds down for flexible eye positioning.

Ideal For

• Maximum sky coverage. Ideal for initial target location. On a mount without tracking, a wide field also keeps an object in view longer between adjustments.
• 2" focuser owners. For those who want a wide-field experience with weather-sealed durability.
• Faint objects. The design makes averted vision easy: looking slightly to one side of a faint object puts its light on a more sensitive part of the eye.

Accessories & Compatibility

• In 2" refractors. In the AR102 (663mm, f/6.5) it gives 17x, a 3.6° true field and a 6.2mm exit pupil; in the AR127 (826mm, f/6.5), 21x, 2.9° and 6.2mm; in the ED127 (952mm, f/7.5), 24x, 2.5° and 5.3mm. All three come with a 2" diagonal.
• More power. The Explore Scientific 2" 2X Focal Extender takes 2" eyepieces and doubles the power, to 41x in the AR127, while keeping the long eye relief.