Aven's SPZ-50 stereo zoom binocular microscope offers zoom ratio with crisp clear 3D images and a wide field of view with 6.7x to 50x continuous zoom with standard 10x eyepieces. The eyepieces provide a constant working distance of 45 mm/1.77" for comfortable viewing. The SPZ-50 stereo zoom binocular microscope is ideal for looking at highly specular and shiny surfaces. It offers flat, even, shadow-free illumination across the entire surface without hot spots and glare. The illuminator mounts to the objective of the microscope and is powered by an LED light controller with adjustable dimmer. Aperture size is 50 x 50 mm.