This is a fully coated Scopetronix zoom eyepiece. You don't need to spend a fortune to get a superb zoom eyepiece. The ScopeTronix 1.25" zoom eyepiece features fully multicoated optics, a flip down rubber eyeguard, and is threaded for filters. The zoom ranges from 7mm to 21mm and it is near parfocal throughout the zoom range. The only reason I am selling is because I am now working on the entire Vixen LV collection 1 by 1.