SkyWatcher 90mm Mak-Cass Bundle Brand New Includes Limited Two Year Warranty The SkyWatcher 90mm Maksutov-Cassegrain Telescope features a long focal length of f/13.8 and 90 mm of aperture. The telescope can be used as a travel companion for various uses like as a telescope for astronomy, a spotting scope for terrestrial use or a lens for photography. It provides portability, sharp, contrasty images and the flexibility to use them as a spotting scope for terrestrial use, a lens for photography and a telescope for astronomy. The high-resolution optical system is multi-coated to maximize contrast and sharpness of image. 90mm Maksutov-Cassegrain Telescope Features 3.54 Aperture 90mm 1.25 90 Star Diagonal 180x Maximum Magnification Focal Length 1250mm, f/13.8 Focal Ratio Red Dot Finderscope Limited-Diffraction Optical System Fully Multi-Coated Optics 25mm 10mm Plossl Eyepieces Vixen-Style Dovetail Plate Specifications .boldTbl{ font-weight bold;} .specs td, table.specs th {padding 4px 10px;} Telescope Series Sky-Watcher Maksutov-Cassegrain Telescope Aperture 3.54 Telescope Focal Ratio f/13.8 Telescope Focal Length mm 1250 Finderscope Red Dot Focuser Style Internal Moving Primary Focuser Size 1.25 Focuser Speed Single Speed Telescope Mount Type No Mount OTA Only