Orion 1.25 Ultra Flat Field 60 Degree 10mm Eyepiece.
Product description
The "UltraFlat Field Eyepiece features a high quality standard and a very compact design, which is designed to remove the field curvature at the edge, resulting in a flat, distortion-free image up to the edge of the visible field of view, even in very fast telesocpes.
$50
