Pentax 70513 SMC-XW 7 Telescope Eyepiece 1.25"

The Pentax SMC-XW 7mm is a premium 1.25-inch telescope eyepiece engineered for demanding astronomical observation. Its 7mm focal length makes it particularly well-suited for planetary, lunar, and double-star viewing, where high magnification and fine detail resolution are essential. The optical design employs high-refraction, low-dispersion lanthanum glass elements with full multi-coating across all surfaces, maximizing light transmission while minimizing ghosting, flare, and chromatic aberration. The result is bright, high-contrast images with sharp edge-to-edge detail across the full 70-degree apparent field of view — a notably wide perspective for a short focal length eyepiece that keeps objects in view longer and provides a more immersive observing experience.

One of the XW 7mm's most appreciated design features is its 20mm eye relief, which is exceptionally generous for an eyepiece of this focal length. Many competing 7mm eyepieces offer only 10-12mm of eye relief, making them uncomfortable for extended sessions or unusable for observers who wear glasses. The Pentax design eliminates this compromise, allowing relaxed viewing regardless of whether corrective lenses are worn. The eyepiece body is built to JIS Class 4 weatherproof standards, providing protection against moisture and dew — a practical consideration for astronomers who regularly observe in humid nighttime conditions. A 43mm adapter-mounting screw thread is available for optional accessories, and the standard 1.25-inch barrel ensures compatibility with the vast majority of telescope focusers.