Alstar 1.25" 2X Barlow Lens - Bundle with - 1.25" O-III Filter

Give your telescope eyepieces a 2x power boost! The Shorty 1.25- inch 2x Barlow Lens doubles the power of any 1.25- inch telescope eyepiece it's used with. For about the price of a single eyepiece or less, the practical Shorty 2x Barlow effectively doubles the number of telescope eyepieces at your disposal. The Shorty 2x Barlow Lens doubles the magnifying power of any 1.25- inch eyepiece, essentially dividing the eyepiece's focal length by a factor of 2. For example: Using a 25mm eyepiece in the Shorty 2x Barlow provides the same magnification a 12.5mm eyepiece would normally exhibit (25 / 2 = 12.5). Using this simple formula, you can easily determine how each of your 1.25- inch telescope eyepieces will perform when inserted in the Shorty 2x Barlow Lens. A 20mm ocular will behave like a 10mm eyepiece; a 6mm eyepiece will provide the magnification of a 3mm eyepiece, and so on. Using the Shorty 1.25- inch 2x Barlow Lens is easy. Simply insert the Shorty 2x Barlow into your telescope's focuser or diagonal, and then insert any 1.25- inch eyepiece into the Shorty, gently securing it in place with the two thumbscrews. Then, adjust the telescope's focus wheels to enjoy double the magnification of the eyepiece used. Think of the money you can save with this practical and affordable telescope eyepiece accessory!

• The 2x barlow lens is full metal constructed and precisely CNC machined; 1.25 inch Telescope Eyepiece Extension Tube; It provides extra focuser back travel which is often needed for short range terrestrial viewing or astrophotographic applications
• Double the power of 1.25 inch telescope eyepiece with the telescope barlow lenses for 1.25 inch eyepieces from Celestron; Orion; Sky Watcher; Meade and most brands of telescope
• Barlow element separates from extension tube and threads directly into a 1.25 inch eyepiece for 2x increase in magnification; The barlow lens provide a high power magnification allow you look more closely and detailed at the surface of moon; other planet
• Each Alstar 1.25 inch O III Filter is individually inspected and proudly inscribed with the percentage of light transmittance of the two O III emission lines
• Not only useful at light polluted sites; the contrast is also increased at dark sky sites; can be used with all 1.25 inch eyepieces; Filter made from high grade glass with dichroic interference and antireflection coatings