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Q&A for Pentax XW Extra Wide Fully Multi-Coated Eyepiece — 3 Questions & 2 Answers

Name Pentax XW Extra Wide Fully Multi-Coated Eyepiece (5)
$372.82 $349.00 Save Up to 25%
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Q
John, guest, from WA, United States, asked on February 22, 2020

What is the relationship between focal length in millimeters to magnification power? I'm looking for 25X eyepiece w/ long eye relief. Which XW Pentax?

A
Answered by CosmoVT, member, from VT, United States, on February 18, 2021

Take your focal length in mm and divide by the focal length of the eyepiece. So, if your telescope is a 650mm focal length and your eyepiece is 20mm: 650/20= 32.5. The 32.5 is the magnification. You could also divide your telescope focal length by the magnification you want to see what size eyepiece you would need for that magnification.

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Q
Jim, guest, from PA, United States, asked on April 01, 2021

What eyepiece would I get to make a spotting scope see a lot further than a 25x

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Q
David Agresti, member, from CA, United States, asked on December 14, 2020

Does the 1.25” barrel unscrew so these lenses can be 2” as well like some other eyepiece kit makers? I need a full set of 2” eyepieces.

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