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 Pentax SMC XW 5mm Eyepiece 1.25"Waterproof Fogproof
20mm Eye Relief NEW     
Brand New in its Original Retail Box


Authorized Dealer - Mfr # 70512 / UPC 027075075207


Here is what you get:

  • Pentax SMC XW 5mm Eyepiece (1.25")
  • Push-On Front & Rear Caps
  • Plastic Helicoid Case
  • Limited Lifetime Warranty

Product highlights:

  • 70° Apparent Field of View
  • 20mm Eye Relief
  • Waterproof & Fogproof



Pentax eyepieces are a near consensus choice amongst serious amateur and professional astronomers as the best that's out there, quite an accomplishment indeed given the fervent passion of the collective.

Pentax eyepieces are JIS Class 4 waterproof, rather impressive particularly given the fact that this includes their zoom model.

The XW line represents an even further improvement upon the venerable XL series. The apparent field of view has been expanded to a whopping 70°, but remarkably this was achieved without reducing their impressive eye relief of 20mm. There are eyepieces available with wider apparent viewing fields, but to take advantage of that wider field you'll have to be much closer to the eyepiece. This isn't exactly conducive to extended observing sessions. Additionally, there are lesser eyepieces with similar claims of 70° apparent viewing fields, but the performance upon the edge of these eyepieces isn't on par with the Pentaxes. If you're using a telescope with a fast aperture, this is of particular importance.


Pentax 70512

Focal Length

Eye Relief

Apparent Field of View

2.4 x 5.0" (61 x 127mm) WxH

0.87 lb (395 g)

Packaging Info

Package Weight
1.29 lb

Box Dimensions (LxWxH)
7.45 x 4.1 x 3.4"



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Filed under: Eyepieces & Accessories