Alstar Telescope Zoom Eyepiece, 1.25 inch 8-24mm Multi-Coated Low Power and High Power Eyepiece, 7 Element 4 Group Telescope Accessories for Astronomic Visual
Parfocal over entire range, so no need to refocus as focal length is changed.
Multi-coated optics for bright and high-contrast views,threaded at bottom for standard 1.25" filters.
Continuous focal length zoom of 8mm to 24 mm for a wide range of magnification without the need to switch eyepieces.
There are a number of things that you will thoroughly enjoy as an owner of this "Alstar 1.25" 8-24mm Zoom Eyepiece" which is specifically designed for both visual and photographic use.
Long eye relief of 15-18 mm for comfortable viewing position, even for eyeglass wearers.