This excellent line of orthoscopic oculars are an amazing value for anyone seeking a high-contrast planetary eyepiece. They feature the highest quality Japanese workmanship, excellent contrast and superior color correction. These eyepieces will satisfy even the most demanding planetary observer, even those used to much more expensive and "flashy" name brand eyepieces. Each or these OR eyepieces is lovingly handmade, one at a time by craftsmen at a Tokyo factory, where they have been producing them now for over 40 years, so you can be sure of optical, mechanical and design quality you can be proud of for years to come. High magnification inclined apo-refractor, Maksutov, SCT and Mewlon users will be especially pleased with their planetary and double star viewing performance. The gorgeous barrel design includes tight filter threads and a super sharp field stop that precisely defines the field of view. For maximum image definition, contrast and light transmission, the eye lens of each eyepiece is multicoated, all other surfaces are magnesium flouride coated. Eye relief is plentiful and images merge well when used in a binocular viewer. Apparent field of view of all focal lengths hovers in the 45 degree range. Currently available in 5mm, 6mm, 7mm, 9mm, 12.5mm, 18mm, and 25mm focal lengths. We recommend the three shortest focal lengths for use with our GT80-45 and GT100-45 binocular telescopes. Eye lens diameters for the shortest three focal lengths range from 3mm for the OR4, 4mm for OR5 and 5mm for OR6.

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