Adding two models to high-performance eyepiece "smc PENTAX XW" series

Adding two models to high-performance eyepiece
"smc PENTAX XW" series:
Achieves the widest 85° apparent field of view in the XW series

smc PENTAX XW16.5
smc PENTAX XW16.5


TOKYO, November 10, 2022 -RICOH IMAGING COMPANY, LTD. is pleased to announce the launch of the high-performance eyepieces "smc PENTAX XW16.5" and "smc PENTAX XW23" for astronomical telescopes.

Main Features

  • 1. Apparent field of view of 85°, the widest viewing angle in the XW series, suitable for observing nebulae and star clusters
  • 2. A new optical system with 7 elements in 5 groups that surpasses the conventional XW series to obtain sharp star images all the way to the edge of the field of view
  • 3. Original multi-layer coating for outstanding light transmission efficiency
  • 4. Advanced light-shielding technology for improved image contrast
  • 5. Weather-resistant* construction for All-Weather viewing

*The XW series features a weather-resistant structure of JIS class 4 *. It cannot be used underwater.


  smc PENTAX XW16.5 smc PENTAX XW23
Focal Length 16.5mm 23.0mm
Lens construction
7/5 7/5
Eye Relief
Figures in parentheses are the distance from the viewing rubber
Apparent Angle of View 85° 85°
Coating* Multi coating
Weatherproof JIS class 4 equivalent (splash-proof)
Sleeve size 50.8mm 50.8mm
Diameter & Length
76mm×142mm 76mm×125mm
inch 3.0in. x 5.6in. 3.0in. x 4.9in.
Weight (+/- 5%) 745g 770g
onz 26.3 oz. 27.2 oz.
Accessories Eyepiece lens cap, Objective lens cap

*Partial coating applied to laminated optical element groups

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