The main binocular and the assistant binocular are fixed in 180°and the coaxial illumination system can give the same visual field, the same magnification and the same illumination to the main binocular and the assistant binocular. 

Specification

Eyepieces
magnification 12.5x, pupil distance adjustable range 55mm~75mm, diopter adjustment range +6D ~ -6D. Focus of second object lens 160mm
Binocular tube
30°~90°variable angle binocular tube
Magnification 
6:1 zoom, motorized, magnification 4x~24x; field of view Φ50~Φ8.2mm
Coaxial assistant’s binocular tube
moterized continual changer, total magnification and field of view is same as chief binocular tube
Coaxial illumination
illumination diameter of light spot Φ50mm, illumination intensity 100000lux
Objectives
f200mm (300mm, 350mm etc )
Focusing
motorized, range +/-25mm, speed 33s/whole distance
X-Y translator
move in X-Y direction motorised, range +/-30mm
Maximum length of arm
1200mm
New stand
swing angle of the carrier arm 0 ~300°,height from objective to floor 
800mm<H<1250mm
Foot switch 
waterproof, 8 function steps