| This short focal length eyepiece has been designed by Thomas M. Back, noted refractor designer, to give you exceptional high power views with a wide variety of telescope types and focal ratios – even under so-so seeing conditions. It will work with f/10 to f/15 catadioptric scopes, providing 580x with a 16” f/10 Schmidt-Cassegrain. It will work with 80mm f/6 refractors, providing 69x with a wide 0.86° field (almost three-quarters wider than the full Moon). And it will work with any telescope type in between. It has been optimized to view bright objects, both on and off axis, while showing maximum detail and definition. It has very high light transmission, very high contrast, minimal lateral color, and minimal light scatter. For Dobsonian users and others without tracking drives, the very low lateral color and other aberrations allow a planet to drift across the entire 60° field while still being sharp and having high contrast, thereby maximizing observing time. While the eyepiece is optimized for observing subtle lunar and planetary detail, its high resolution and high contrast work equally well for splitting binary stars, resolving compact globular clusters, etc. A light coating of lubricant has been applied to the threads in the eyepiece’s twist-up eyecup. If any lubricant is visible on the inner eyepiece body when the twist-up eyecup is in the extended position, remove the excess lubricant with a clean wipe, such as a tissue. Operate the twist-up eyecup several times, cleaning the body as necessary until no more lubricant is visible on the eyepiece body when the twist-up eyecup is fully extended.
|
Printer friendly version
Email page link to a friend
