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Astronomical telescope TWR60-900 astronomical binoculars is professional astronomical telescopes made by Yunnan North Optical Electron Group CO.,Ltd . Astronomical binoculars TWR60-900 is very suitable for beginners use. TWR60-900 telescopes astronomical binoculars Specification: Model TWR800 TWR900 focusing(mm) 800 900 Field of view 53′6′14″ 47′6′ Entrance Pupil Diameter 60 Limit level 10.3 Resolution 4.62″ Magnification of Objective K10 80 90 Magnification of Objective H25 32 36 Magnification of finderscope 5 FOV of finderscope 5°42′