The Baader Hyperion 68° 5mm Modular eyepiece uses high quality Phantom group-coatings for maximum contrast and zero internal reflections. The Hyperion range of multi-function eyepieces feature a modular design with the ability to change the focal length via extension rings. Both 1.25" and 2" barrels are included, with the 1.25" barrel able to be unscrewed to add fine tuning rings. Because this section contains the first group of lenses, changing the spacing allows you to change the focal length. Each barrel is threaded for connection of all standard 1.25" and 2" filters. The M43-Video-Photo thread for afocal and classical projection photography, permits optional adaptation of practically any camera with optional accessories. Various focal lengths are possible with the addition of FTR fine tuning rings. Baader Hyperion eyepieces provide a wide 68° apparent field, sharp field stops and excellent ergonomics for comfortable observing. Baader's Phantom Group coating is a 7-layer broadband anti-reflective coating with extremely low residual reflection. Each group of lenses has this coating applied. The coating has been optimized so that they are most effective where the human eye has its greatest sensitivity at night, at around 520nm. Specifications Focal length 5 mm Optical design Modular Barrel 1.25", 2" Camera connection M43, SP54 Lens elements / groups 8 / 5 Apparent field of view 68° Parfocal Yes Eye relief 20 mm Field stop 5.9 mm Field stop displacement to reference plane -23.5 mm Eyepiece body above reference plane 80.1 mm Length of 1.25" barrel 24 mm Length of 2" barrel 47.5 mm Diameter 58 mm Weight 401 g SKU BA2454605 Items included Baader Hyperion 5mm eyepiece Dual 1.25" & 2" nosepiece Winged rubber eyecup 1.25" dust cap M48 dust cap M45 dust cap Soft leather bag
