3.5X-90X Trinocular Zoom Power Stereo Microscope Head 3.5X-90X super widefield continuous zoom magnification power Crystal clear stereo erect images over a super wide field view 2-1/2" (65mm) super widefield view and 8" (200mm) large working distance Super widefield high-eyepoint 10X eyepieces with FOLDABLE eye-guards Trinocular port for adding photo or video capability