The 55mm focal length has the largest true field possible for 2" eyepiece holders -3 times the true field area of any 1¼" eyepiece. The focal plane is placed at the end of the barrel to minimize vignetting. Performance with Schmidt-Cassegrains is remarkable since it avoids the image degradation and severe vignetting which occurs when using telecompressors. Long eye-relief and unique adjustable eyeguard for eyeglass wearers.

Note on focusing the 55mm Plössl eyepiece
Because the field stop is located near the bottom of the chrome eyepiece barrel, you will need to rack your focuser out further, relative to most other eyepieces. If you find that you cannot rack your focuser out enough to achieve focus, we strongly recommend you purchase our 2" Eyepiece Barrel Extender (product code EBX-2120), available at all Tele Vue dealers. The Eyepiece Barrel Extender will make Tele Vue's 55mm Plössl eyepiece approximately parfocal with our 27mm Panoptic eyepiece.