![]() Converted grades are calculated using the modified Bavarian formula, as stipulated by the resolution of the Kultusministerkonferenz (German PDF, 0,1MB). New from SV? On my f/5 to f/6 test scopes, stars started to distort 50 percent out from the center and were quite bloated at the edge, the poorest optical performance of the group, but one thats commensurate with price. Bottom Line: A better bargain 82 eyepiece. ![]() ![]() I can easily watch a close double drift past the field stop of a type 6 Nagler and often do. Night Sky Challenges and the Astronomical League. That doesn't happen with 100 degree eyepieces. Note: For definitions of basic eyepiece characteristics mentioned below, see Ed Tings A Beginners Guide to Telescope Eyepieces. For wide field eyepieces, TeleVue introduced nearly all the modern designs starting with the first Nagler more than 40 years ago. There are lots of OEM products floating around. Has similar build quality to TeleVue and has a better feel than its APM counterpart. My conclusion from testing this 82 group was that the Explore Scientific came very close to matching the standard-setting premium Tele Vue Nagler, but at a lower price. So if you assign numerical values in ascending order starting with 1, the input for the grade conversion is as follows: In the conversion tool, you enter 1as maximum grade (corresponding to A+), and 5 asminimum passing grade (corresponding to D). A+ is the highest possible grade, and the lowest grade to pass a course is D. Please Log In to view the details for this classified ad. Bottom Line: A top-class eyepiece for optics and build quality. The main drawback is the massive 833 gram weight, by far the highest of the 100s. For 1.25" 82 eyepieces, I have a mixed set of Televue, ES, and UWA. Now if you had a more expensive 30mm EP, that FOV will remain sharper to the edge. Optical performance also proved similar, with stars in the Meade beginning to distort 60 percent out from the center and appearing fairly aberrated at the edge of field. This is a superb eyepiece for the money, with the bonus of argon-filled waterproof construction to keep moisture from penetrating and fogging the eyepiece on humid nights. ![]() This 9 mm eyepiece is ideal for moderate power work on moons, planets and dark sky objects. They're still well regarded, though the 28mm is said to be ergonomically awkward to view through. ![]()
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