Vixen ED80Sf 80mm (3.15 inch) ED Apochromatic OTA Refractor Telescope with 7x50 is a part of the high quality and dependable Telescopes from Vixen. All of the features you need for a price you want. Telescopes from Vixen are well known for their quality and Vixen ED80Sf 80mm (3.15 inch) ED Apochromatic OTA Refractor Telescope with 7x50 upholds that standard.