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Alstar 1.25" 7-21mm Zoom Eyepiece for Telescope - A ALSTAR, SKU_AM_ZE7T21AS A ALSTAR SKU_AM_ZE7T21AS The Explorer II Zoom eyepiece lets you change magnification power without physically changing eyepieces. A twist of the zoom eyepiece housing changes focal length from 7mm to 21mm, providing a variety of viewing magnification powers. Eyepiece consists of four elements which are fully coated with anti-reflection coatings for clear, contrasty views. Exceptionally long 16mm-to-33mm eye relief range 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 like-sized eyepiece filters.

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