Complete package includes 125mm rings and 80mm Guidescope Compatible with Celestron NexGuide Autoguider Metal focuser with tension screw minimizes mechanical "play" when focusing making it easier to keep guide star on chip. Now you can get a complete guidescope package from Celestron which includes both 80mm refractor and 125mm rings. No need to fumble in the dark with an uncomfortable diagonal, because the included extension tube helps you to easily reach focus. What's more, it's also compatible with the Celestron NexGuide Autoguider by sliding it in - or threading it directly on! The quality 80mm refractor guidescope with a 600mm focal length and focal ratio of f/7.5 includes a metal focuser with tension screw to help to minimize mechanical "play" when focusing. General Aperture: 80mm (3.15") Focal Length: 600mm (24") Focal Ratio: f/7.5 Highest Useful Magnification: 189x Lowest Useful Magnification: 11x Limiting Stellar Magnitude: 12 Resolution (Rayleigh): 1.74 arc seconds Resolution (Dawes): 1.45 arc seconds Light Gathering Power (Compared to human eye): 131x Optical Tube Weight: 3.94 lbs (1.79 kg) Weight of Tube Rings: 2.69 lbs (1.22 kg) Weight: 6.69 lbs (3.03 kg)
