ITEM NO. 110207 Model F900X70 Optical System Refractors Aperture( mm) 70 mm Focal length( mm) 900 mm F/ D 12.9 Resolution( 3) 1.663 Limiting Magnitude 11.1 Concertrating Power 100X Optical Tube Weight 1.25KG Optical Tube Length 88 cm Mount Equatorial Tripod Aluminum Mass( g/ oz) 7 Size H X W -