7-21mm Zoom Eyepiece. These Zoom Eyepieces provide the benefits of a continuous adjustable power for an affordable price. It allows you to find an object at low power, and then zoom in until you reach the desired magnification. The fold-down rubber eyecup provide comfortable viewing for eyeglass wearers. Specification: Brand new & high quality The Zoom eyepiece lets you change magnification power without physically changing eyepieces A twist of the zoom eyepiece housing changes focal length from 21mm to 7mm, providing a variety of viewing magnification powers Eyepiece consists of four elements which are fully coated with anti-reflection coatings for clear, high contrast views Exceptionally long eye 33mm relief allows eyeglass wearers to enjoy the entire view while still wearing their corrective lenses without vignetting. The 1.25" barrel is threaded for use with any 1.25" eyepiece filters Weight: 170g Color: Black | 
