The EHD0756 Zoom Series compact optical system with magnification ratio of 1:8, and a magnification from 0.7 to 5.6X.  The Optical Quality of the EHD0756 adopts semi-apochromatic parallel optical imaging system, and uses advanced multi-layer coating technology, which perfectly correct the imaging on the edge of field of view, get high-resolution and high contrast images, and naturally restore the true colors of observed objects.