The Pentax eyepiece has an improved 70 degree field of view for easier viewing. The 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. The XW 14, 20, 30, and 40 are designed specifically to provide ideal viewing conditions when used with a telescope. They have fully multi-coated lenses increase light transmission and color quality.