Optional trinocular eyepiece Last updated Save as PDF Your microscope may have either a monocular eyepiece with only the camera or it may have the trinocular eyepiece with the camera and visual eyepieces. A Visual eyepieces Adjustable eyepieces for looking at the sample. Best used with the optional joystick. B Three-position view selector Controls the light path for the eyepieces. In: Eyepiece only, no camera Middle: Eyepiece and camera Out: Camera only, no eyepieces C Camera The USB camera is operated with OMNIC Paradigm software.