AmScope 7X-45X Simul-Focal Trinocular Zoom Stereo Microscope Head 7X-45X super widefield simul-focal continuous zoom magnification power Crystal clear stereo erect images over a super wide field view Super widefield high-eyepoint 10X focusable eyepieces Trinocular port for adding photo or video capability 48mm (in diameter) female thread for adding Barlow lenses or lights