Specifications
Lens	20D Volk Nonspheric Lens
Bulb	ORSAM's
Filters	Red free, cobalt blue, compensation lens
Additional prism	Teaching tube
Angle of visual field	45 +/- 5 degrees
Range of pupil distance	52mm-74mm
Input voltage	220V 50 Hz
Working voltage	6v10W halogen bulb
Weight	230g without head bracket
Head Adjustment Range
Head Girth	530mm-630mm
Depth	85mm-125mm