"The Baader Planetarium HYP-5 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|It is totally free of blackouts and other annoying exit pupil behaviors, delivers long eye relief (17 mm), virtually zero distortion, and is sharp to the edge even in fast telescopes|Its flat focal plane is particularly suited to very fast newtonians that use coma correctors. The 29 mm field stop makes the 24 mm Hyperion the widest 24 mm eyepiece. The 24 mm Hyperion is also the smallest and lightest of the Hyperion|High grade water-white glasses are used throughout to deliver a crystal clear view with low scatter and excellent color fidelity, free of the yellow or bluish coloration imparted by many other eyepieces|Use of high-index glasses delivers low distortion and astigmatism, even on scopes as fast as f/4|Baader Planetarium has gone to great lengths to give the Hyperion the most advanced multicoatings ever used on amateur telescope eyepieces|The Hyperion Phantom Group multi-coatings and coating equipment are proprietary to Baader and have been designed by coating engineers specifically for the Baader Hyperion, and optimized for each of the glasses used|These coatings are applied with the latest thin-film German coating equipment, training, and process controls. The result are coatings that truly rival the best in the world - including the famous Zeiss Abbe Orthoscopic|The proprietary Hyperion housings have been engineered by Baader to incorporate careful opto-mechanical design and execution of internal baffling to eliminate stray light and ghost reflections|Uncapping the eyelens reveals a pitch black interior, with no distracting and contrast-robbing glints of light from unbaffled lens or metal surfaces|Superb fit and finish. Eyepiece barrels are accurate to size, nicely machined, and hard anodized|Works in both 1.25" and 2" focusers. The 1.25" barrel is threaded for filters and kept short (0.94") to work well in binoviewers and spotting scopes. Baader's new housing incorporates a full-length 2" barrel (0.94" long)|Soft folding rubber eyecups work for both normal and eyeglass users. Each Hyperion comes with protective lens caps and leatherette storage pouch|The Hyperion eyelens housing is compatible with the full range of correcting lenses from 1/4 to 3-1/2 diopters. Observers with any astigmatism will really appreciate this feature, no longer needing to wear eyeglasses to see stars as true pinpoints|The long 20 mm eye relief of the Hyperion works particularly well with these corrector lenses, without forcing the observer to press their eye close to the lens in order to see the entire wide field|Baader Hyperion incorporate some unique and innovative aspects, which are designed to make them the ideal projection eyepiece; the optical design of the Hyperion enables them to work as an extremely sharp wide-field projection eyepiece for even large|The eyelens barrel has been provided with two different external threads, M43 and M54 (these are covered by the removable rubber eyecups)|The front negative lens element is designed to be removed (and exposes an M48 2" filter thread). This converts each Hyperion into a longer focal length high-quality projection eyepiece, giving the imager two choices of focal length with each eye"