This 45° inclined trinocular zoom stereo microscope head is ideal for laboratory and industrial applications. The head is simul-focal which means the photo port and both eyepieces can be used simultaneously. The interpupillary distance is adjustable from 54 to 76mm and both ocular tubes have a diopter adjustment of ±6. This head has a standard magnification range of 7X - 45X with a parfocaled optical design that ensures that images remain sharp, crisp, and focused, throughout the entire magnification range. Head has a large 2 1/2" field of view, 100mm working distance and is designed to fit in focusing blocks with 3" (76mm) annular ring.