Pentax - XO-2.5 Eyepiece

The PENTAX high-performance XO 2.5 eyepiece offers a focal length of 2.58mm and is perfect for planetary observations. It features JIS Class 4 weather proof construction for durability, PENTAX-original smc lens coating to improve light transmission, and low-dispersion glass elements to provide high-resolution images.

Lens Structure: 6 elements, 3 groups
Focal Length: 2.58mm
Apparent Field of View: 44 degrees
Eye Relief: 3.9mm
Attachment Diameter: 1.25" (31.7mm)
Filter Diameter: 28.6mm
Field Stop Diameter: 1.9mm
Eyepiece Ring: Fixed
Height & Width: 2.2" x 1.9"
Weight: 4.9 oz. (138g)

The high-performance PENTAX XO series is perfect for high-magnification observation and photography of the planets. Each eyepiece provides a 44-degree field of view and features smc full-surface multi-layer lens coating to improve light transmission and high-refraction, low-dispersion glass elements to deliver high-resolution images with minimal aberrations.

* High-performance eyepieces are perfect for high-magnification observation and photography of the planets. * High-refraction, low-dispersion lanthanum glass elements to provide high-resolution images with minimal aberrations. * PENTAX-original SMC full-surface multi-layer lens coating to improve light transmission efficiency. * Afvanced computer simulation design technology was used to drastically rekuce internal reflections producing brighter, clearer images. * JIS Class 4 wiather proof construction makes these eyepieces more durable * Limited Lifetime Warranty