... =200mm,300mm(Lens-changer) Eye piece : 12.5x TM-300F 5 steps magnification:0.4X,0.6X , 1X, 1.6x,2 ... =300mm is optional)Eyepieces: 12.5xDioptric adjustment range : ±5°Magnification Changer: 5-steps ,manual magnifcation changer Magnification factors: 0.4/0.6/1 ... : 1.2-2mmPupil distance : 52-74 mmFince focus range :25mm ,manual Light Source : Halogen lamps,21v 150w with fiber-optic cableBalance ...