Pentax XW is a series of professional astronomical glasses characterized by a wide field of view and excellent correction of chromatic aberrations and distortions.

The Pentax XW 20 mm model is equipped with a six-element optical system, part of which is made of low-dispersion lanthanum glass. The lenses are arranged in four groups and are covered with a multi-layer Pentax Super-Multi Coating coating with a light transmittance exceeding 96 percent for the 560 nm line, and in order to ensure the best contrast, the location of the diaphragm limiting internal light reflections was selected by computer simulations.

The casing of the eyepiece has been additionally sealed, which means that fog or even a falling drizzle does not pose any threat to it. The eyepiece has a standard 1.25 "frame and an M43x0.75 thread, so it can be used with an extremely wide range of optical instruments.

The most important features of the Pentax XW 20 mm eyepiece

• low-dispersion optical system with a field of view of 70 ° at a focal length of 20 mm
• Pentax SMC full multi-layer coating with transmission over 90 percent
• positioning of the diaphragm optimized for the greatest effectiveness in eliminating internal reflections
• large offset of the exit pupil enabling observation in corrective glasses

Technical parameters

• eyepiece series: Petnax XW
• apparent field of view (AFoV): 70 °
• focal length of the eyepiece: 20 mm
• offset of the exit pupil: 20 mm
• eyepiece optics: low-dispersion
• low dispersion lens material: lanthanum glass
• lens system: six lenses in four groups
• type of coating: full multi-layer coating Pentax Super-Multi Coating (SMC)
• diameter of the frame: 1.25 "
• mounting thread: M43x0.75
• water resistance class: JIS 4
• eyepiece length: 86 mm
• eyepiece diameter: 61 mm
• weight: 355 g

Elements of the set

• Pentax XW 20 mm eyepiece

guarantee

24 months