The Aven Tools 26700-151 Micro Lens System Zoom 640 produces crisp and clear images that are distortion-free and void of chromatic aberration. The Micro Lens System includes detents that allow you to calibrate the lens for measurement repeatability. The system includes a standard 1x C-mount coupler and 1x objective lens. Total magnification is 0.6x to 4.0x, while field of view is 6 x 8 mm at low magnification and 0.8 x 1.2 mm at high magnification. The working distance measures 3.23 in. (82 mm). Additional couplers and objective lenses are available separately to help you configure a lens system to meet your individual applications.