Pentax - XW-3.5 Eyepiece

PENTAX Corporation is pleased to announce the introduction of the smc PENTAX
XW series of eyepieces designed for use with PENTAX-brand spotting scopes and
telescopes in ground and astronomical observations. Consisting of eight models
with a focal length ranging from 3.5mm to 40mm, the new XW series features a
wide apparent angle of view (70 degrees), JIS Class 4 weather-proof
construction and a long eye relief (20mm). The new optics, incorporating
high-refraction, low-dispersion lanthanum glass elements and PENTAX-original
multi-layer coating, delivers bright, high-resolution images with minimal
aberrations and distortions.
 The new XW series retains all the popular features of the current XL series, including eyepiece
shape, while upgrading many vital specifications. All XW models feature a 70-degree apparent angle
of view, delivering a more dramatic, wide-perspective image than the 65 degrees of the XL series.
Laminated optical elements are treated with the innovative partial coating, which offers much
higher light transmission capability than conventional full-surface coating. Thanks to advanced
computer simulation technology, internal reflections are drastically reduced to produce brighter,
clearer images.

Replacing the existing XL series, the new XW series can be used with the PENTAX PF-80ED, PF-80EDA
and PF-100ED spotting scopes and a range of PENTAX telescopes to optimize their performance and
capability. The XW7, XW10, XW14 and XW20 models are suited for both ground and astronomical
applications, while the XW3.5, XW5, XW30 and XW40 models are exclusively designed for astronomical
observations.

# Improved 70 degree field of view for easier viewing
# XW 7,10, 14, 20 will give a wider field of view than our previous eyepieces when used on Pentax
Spotting Scopes or with telescopes.
# WX 14, 20, 30, and 40 are designed specifically provide ideal viewing conditions when used with
a telescope
# Fully multi-coated lenses increase light transmission and color quality
# High-refraction, low-dispersion lanthanum glass elements deliver bright, high-resolution images
with minimal aberrations and distortions
# Advanced computer simulation design technology was used to drastically reduce internal
reflections producing brighter, clearer images
# JIS Class 4 weather proof construction makes these eyepieces more durable
# Long eye-relief for viewing with or without glasses
# Limited Lifetime Warranty 

	

With unsurpassed optical clarity and the shortest focal length in the XW series, the XW 3.5 offers
a 70 degree field of view for easier viewing. All of our eyepieces are constructed with a
high-refraction, low-dispersion lanthanum glass that consistently delivers bright, high-resolution
images with minimal distortion. In addition, all XW series eyepieces are built to JIS Class 4
weather-proof standards which increases their durability in less than ideal conditions. Designed
for use with a wide range of telescopes and PENTAX brand spotting scopes, the XW series eyepieces
are a clear choice for ground and astronomical applications.

Lens Structure: 8 elements, 5 groups
Focal Length: 3.5mm
Apparent Field of View: 70 degrees
Eye Relief: 20mm
Attachment Diameter: 1.25" (31.7mm)
Filter Diameter: 28.6mm
Field Stop Diameter: 4.3mm
Eyepiece Ring: Helicoid type
Height & Width: 5.4" x 2.4"
Weight: 14.3 oz. (405g)