"The Baader Planetarium HYP-21 Hyperion 68-degree Modular Eyepiece offers world-class performance and unique photo-visual features. No longer do amateurs need to spend more on their eyepieces than their primary instrument in order to get true high-end performance in a wide-field eyepiece. Not just a different branded version of their highly regarded cousins, the Hyperion has been totally redesigned to deliver better transmission, contrast and useful new features. Baader Planetarium has worked hard to give the Hyperion the world's finest optical coatings, superb mechanics and their unique multifunctional design.The Hyperion delivers superb sharpness and color fidelity across their 68-degree wide, flat-field, even in fast telescopes. From their superb on-axis and off-axis sharpness to their pitch-black high contrast field, the Hyperion really works. Viewing through a Hyperion is notably comfortable and relaxing, due to their forgiving eye-position, 20 mm of eye-relief, extra-large eyelens and an optical design that is free of annoying 'kidney-beaning' and blackouts.|Consisting of 8 elements in 5 groups (3.5 mm - 21 mm), the Hyperion optical design delivers outstanding sharpness and color correction over a 68-degree wide apparent field (65 degrees for the 21 mm)|The Hyperion optical design has been chosen to deliver a exceptionally comfortable view, thanks to its 20 mm of eye-relief, large eyelens, and a pupil free of the kidney-beaning and blackouts common in many wide field eyepieces|The new 24 mm uses a different optical design and delivers the same outstanding performance over it's 68-degree wide apparent field"