Explore Scientific 82° 24mm Waterproof Eyepiece - 2"

An Immersive 82° Apparent Field at 24mm

The defining feature of this eyepiece is its 82° apparent field of view, which creates a vast, panoramic window onto the sky. This comfortable ultra-wide field naturally promotes relaxation at the eyepiece, and the effect is a full-immersion experience.

The 24mm suits globular star clusters, planetary nebulae, the bright cloud structure near the nucleus of comets and initial observations of planets. The wide field also makes averted vision easy: looking slightly to the side of a faint object puts its light on a part of your eye that is more sensitive to light, allowing you to see fainter images.

7-Element, 4-Group Design with EMD Coatings

The 24mm uses 7 lens elements in 4 groups. The computer design, combining low dispersion and high refractive index glasses with durable EMD coatings, is optimized for high contrast, high resolution and flat field characteristics.

• Enhanced Multilayer Deposition (EMD) Coatings: Durable EMD coatings on the lenses.
• Internal Baffling: All internal surfaces of the barrel are flat black to keep internal reflections to a minimum.
• Edge-Blackened Lenses: The lens edges are blackened to minimize scattering of light within the lenses.

17.5mm of Eye Relief for Viewing Comfort

Long observing sessions require a comfortable eyepiece, and eye relief is a critical component of that comfort. The Explore Scientific 24mm eyepiece features a generous 17.5mm of eye relief, which is the distance your eye must be from the top lens to see the entire field of view. This ample distance allows you to observe in a more relaxed posture without pressing your eye right up against the lens.

The 82° Series has long eye relief; how much of the field an eyeglass wearer sees depends on the glasses.

Argon-Purged for a Waterproof, Fog-Proof Seal

Each eyepiece is O-ring sealed and purged with an inert gas to create a waterproof environment and a fog-proof housing.

The lenses sit in precision machined metal barrels that keep the optical train aligned for years of rugged use in the field.

The 704g, 2-inch Barrel and 33.5mm Field Stop

The Explore Scientific 24mm eyepiece uses a 2-inch barrel format, which is essential for delivering its ultra-wide view. Its 33.5mm field stop, the opening that defines the edge of the field, is wider than a 1.25-inch barrel allows.

A tapered 2" barrel adds extra security. At 704 g and 110mm by 70mm, it may need careful balancing on smaller telescopes.

Using Explore Scientific 2" Focal Extenders

Explore Scientific Focal Extenders raise magnification while keeping the eyepiece's native apparent field and eye relief. The 2" models are the FE02-020 (2x) and FE03-020 (3x).

With the 2x the 24mm gives the magnification of a 12mm eyepiece, and with the 3x that of an 8mm.