This stereoscope has a depth of focus, field flatness, zoom parfocality, and long working distance that improves inspection accuracy and flexibility. The high-point eyepieces offer ergonomic comfort and eliminates eyestrain. It has a zoom range from 6.5X to 45X (0.65x-4.5x). Also available in trinocular format; please inquire for this additional cost if you intend to use a camera.