This binocular microscope features a zoom range of 1x to 4.5x (total magnification is 10x to 45x). It comes standad with 10x Widefield Achromatic eyepieces with good eye relief for comfortable viewing. ACC has pre-adjusted the eyepiece diopters for parfocality throught the entire zoom range. The interpupillary distance adjusted from 54mm to 75mm. Working Distance - 3 3/4", Field of View - 1" at 10x and 1/4" at 45x. The ISZ1045L features dual variable control, top and bottom LED lighting. All of this is framed in a machined cast aluminum tack base. Includes a vinyl microscope cover.