Barlow Lens 3x 1.25inch 4-Element for Planetary Visual and Photography
 
4-Elements with fully multi-coated enhanced coatings, resulting in bright, sharp images;
Edge-blackened to eliminate internal light scatter to maximize image contrast;
Flatter field-of-view, with excellent control of chromatic and spherical aberration;
Increase Your Magnification Without Sacrificing Magnification Factor or Eye Relief.