The Sky-Watcher 28mm LET 2″ eyepiece is a modified Kellner with large eye lens, 20mm eye-relief and twist-up eyecup for comfortable viewing at a remarkably low price. Fully multicoated optics and blackened interior for brightness and contrast. Specification Focal length : 28mm Apparent field of view : 56° Nosepiece : 2″ with milled undercut and filter thread Field stop diameter : 31mm Number of elements : 3
