1.25" 2x achromatic Barlow increases the magnification of each eyepiece and effectively doubles or triples the number of eyepieces in your collection | Full unit increases magnification of eyepiece by 2x | Barlow element can be separated from main tube and threaded directly into a 1.25" eyepiece for approximately 1.5x increase in magnification | Low "Shorty" profile maintains a comfortable viewing position | Two-element, fully-multicoated lenses with excellent color correction, sharpness, and image brightness