Vixen Optics 39956 ED80S Refractor Telescope with Porta II Mount (White) Optical tube :80mm (3.15") ED Apochromatic Multi-coated Focal Length / f# :600mm f/7.5 Accessories :Dovetail Plate, Tube Rings, Finder Scope, Flip Mirror, Case Mount Weight: 15 lb. including tripod vertical and Horizontal Slow Motion: 120Tooth Wheel Gears whole circle movement; Friction control system Ed80Sf 80mm f/7.5 Telescope Includes Vixen's Universal Dovetail Tube Plate, Rings and Aluminum Case Ideal for Prime Focus or Eyepiece projection photography. Porta II Mount with locking extension legs, accessory tray and flexible handle slow motion control.