Pentax XW 5mm

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About this product

This short focal length eyepiece is particularly popular as it delivers more-or-less the maximum useful magnification from an 8-inch or 10-inch f/10 Schmidt-Cassegrain telescope.

Features

• High-refraction, low-dispersion Lanthanum glass.
• Pentax Super Multi-Coatings (SMC) on all air/glass surfaces.
• Edge-blackened optics and optimised baffles minimise internal reflections.
• Optically corrected for use with focal ratios as fast as f/4.
• 20mm eye-relief and twist-up rubber-rimmed eyecups - perfect for spectacle wearers.
• Chromed barrels threaded to accept filters.
• Weatherproof to JIS Class 4 standards.

Lens Structure: 8 elements, 5 groups

Focal Length: 5mm

Apparent Field of View: 70 degrees

Eye Relief: 20mm

Attachment Diameter: 1.25" (31.7mm)

Filter Diameter: 28.6mm

Field Stop Diameter: 6.2mm

Eyepiece Ring: Helicoid type

Height & Width: 5.0" x 2.4"

Weight: 14.0 oz. (395g)

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