Great hand held zoom monocular providing zoom from 10x to 120x power. Multi coated optics with BAK4 roof prism, 30mm achromatic objective has a clear diameter of 25mm. Has tripod mount and adjustable eyeguard. Nice wide Field of view at 3.8 degrees for 10x and 2 degrees for 120x. Compact size only 5 inches long. This is super and is the same as out T1689 but without the microscope attachment. Includes soft carry puuch. Unused.