MEADE 50203 Polaris NGC-60 Refractor Telescope with Self-Guided Computer: Single-arm telescope with standard-equipment computer controller. 60mm-diameter achromatic, coated objective lens. Optical diameter: 60mm. Focal length; f/ratio: 700mm; f/11.7 Three (.965") eyepieces: SR4mm (175X), H12.5 (56X) & H25mm (28X). Includes 3x Barlow lens. Includes diagonal mirror, tripod & StarFinder(TM) software. Requires single 9V battery. Full Manufacturer's Warranty