Stretchable distance: 1620 inches Color classification: blue The base has a builtin standard tripod threaded interface for mounting a tripod for stable viewing. It is infinitely variable from near to far and can be adjusted by multiples. The 100mm large objective lens has a stronger concentrating effect and a brighter field of view. Optical design: Newtonian reflectionCaliber: 76mmFocal length: 700 mmFocus ratio: F9.21Eyepiece: 20mm 35XEyepiece: 10mm 70XFinder mirror: CE red dot finderTheodolite: Lightweight AZ theodoliteTripod: 1 inch steel pipe standEffective maximum magnification: 180×Effective minimum magnification: 11×Limit star: 11.9Resolution: 1.83 arc secondsResolution 1.53 arc secondsConcentrating ability (relative to the human eye): 118 x1.7 degree apparent field of viewLinear field of view: ( 1000 yards) 89 feet (27 meters)Optical coating: aluminum coatingLight pipe length: 660 mmGross weight: 5.44 kg Magnification: about 3090 times (depending on the actual situation).