Seamless 7-21mm Stepless Zoom for Planetary & Deep Sky Viewing: Effortlessly adjust magnification from 7mm to 21mm with a smooth twist of the zoom housing; This versatile eyepiece eliminates the need for multiple fixed lenses; making it ideal for observing lunar craters; planetary details; star clusters and nebulae without interrupting your stargazing session; Experience precise; continuous zoom control for both astronomy and terrestrial viewing
Extended 16-33mm Eye Relief & Foldable Eyecup for Eyeglass Wearers: Designed with an exceptional 16mm to 33mm adjustable eye relief; this eyepiece fully accommodates observers who wear glasses; providing a clear; vignette-free view; The foldable soft-rubber eyecup ensures comfort for all users; allowing for extended observation sessions at every focal length without eye strain or discomfort
Premium 7-Element, 4-Group Multi-Coated Optical System: Features a high-performance 7-element 4-group optical design with multi-layer anti-reflection coatings; This premium configuration delivers exceptionally sharp; high-contrast; and bright images; Blackened lens edges and anti-reflective threading effectively eliminate stray light and internal reflections for vivid; true-to-life celestial observation and astrophotography
5X short Alstar Barlow Lens offers an ultra-short design and apochromatic correction you can combine the Barlow lens with an eyepiece or a camera; Observe objects with remarkable sharpness and excellent contrast
4-element Barlow: The combination of three lens elements means the Alstar 5X short Barlow provides particularly clear and sharp images; Filter thread for any 1.25 inch filter