APM Telescopes offers a whole series of Ultra Flat eyepieces. The focal lengths are staggered from 10mm, 15mm, 18mm, 24mm and 30mm. The FOV is 65° - the 30mm eyepiece has a FOV of 70° and a 2" connection. The FOV are clearly visible. The eyepiece series up to 24mm is ideal for large APM binoculars.
The 1.25 "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.