Design principle: two parallel beam paths optic 

          system,        modular construction

(2)  Standard set:  SM optic head with 1.0x  plan 

          achromatic   objective

(3)  Zoom range: 0.62x-5x

(4)                     Zoom ratio: 8:1                         

(5)     Magnification: 6.2x-50x 

             (with accessory lens: 1.9x-400x )

(6)     Working distance: 80mm 

         (with accessory lens: 26mm-296mm)

         (7)Field of view:  33.9mm- 4.2mm        

         (with accessory  lens: 106mm- 0.6mm)

         (8)Interpupillary distance: 50mm-75mm 

(9)  Dioptric correction:      +5 -- -5

(10)         Optional objective: planachrmatic: 0.32x , 0.5x,

         0.63x achromatic: 1.6x, 2.0x

(11)         Optional eyepiece:       WFH10x-D/21, WF16x,                

                                                  WF20x, WF25x, WF40x