3.35X-45X Trinocular Boom Stereo Microscope w/Focusable Eyepieces 3.35X-45X continuous zoom magnification with super great flatness and contrast Focusable extreme widefield fully-coated optical system offers top quality sharp clear images 2-3/4" (70mm) extreme large field of view and 8" (200mm) large working distance 3D boom stand allows you to point microscope head in any directions desired Trinocular port for adding photo or video capability