- ITEM NO. 110209 - Model F700X60 - Optical System Refractors - Aperture(mm) 60 mm - Focal length(mm) 700 mm - F/D 11.7 - Resolution(″) 1.93″ - Limiting Magnitude 10.8 - Concertrating Power 73X - Optical Tube Weight 0.75KG - Optical Tube Length 72 cm - Mount Alt-Azimuth York - Tripod Aluminum - Mass(g/oz) 3 - Size H X W