Alstar 1.25 inch 5X Barlow Lens,4-Element Multi-Coated Telescope Accessory for Astronomy Planetary Observation, High-Power Magnification with ED Glass Optics

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 Fully Multi-Coated Optics: A significant advantage of this lens is the complete absence of chromatic aberration typically observed in achromatic lenses; Each lens element is multi-coated ensuring high light transmission and consequently producing a bright clear image Ultra-Short Length: Use this Barlow where in particular where you need a shorter length; Sometimes the total accessory length with eyepiece, adapter or camera can be rather long; The Alstar short Barlow has a length of only 42mm Compression Ring Design: The built-in compression ring secures your eyepieces across a surface rather than at a single point. This design ensures enhanced protection against scratches and deep grooves