Vixen NPL 8 mm 1.25' eyepieceVixen NPL 8 mm 2-group, 4-element Plossl design; it offers flat and clear images with well-corrected chromatic aberration
The 2-group 4-element Plossl design of Vixen's NPL Series delivers bright, sharp views with high contrast and good colour correction. The 20mm, 25mm, 30mm and 40mm models feature twist-up eyecups. All have fully-multi-coated optics. Affordable eyepieces that offer a noticeable improvement over generic Plossls supplied with most telescopes.
Threaded barrel accepts 1.25" filters and features a 'safety undercut' to prevent the eyepiece falling out of the focuser.
30 and 40mm: due to the 1.25" barrel size the 30 and 40mm eyepieces show almost the same area of sky so, for visual use, the 30mm is the better choice. The 40mm is however useful when a compact camera is positioned over the eyepiece for afocal photography.