Premium Celestron Accessory Zoom Eyepiece 7-21mm Fully Multi Coated Optical Lens
 
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 filte