Optotune EL lenses enable you to have very fast and flexible changes in the focal length and thanks to the "frequency" feature you can even achieve several focus changes within a single exposure. As electronic adjustments are performed within milliseconds, the focus adjustments can be executed quickly and easily - and if necessary within one single exposure. Objects of various sizes can be inspected either in a very short sequence or all at once. The Optotune EL enables you to inspect changing objects comfortably without tedious mechanical adjustments to the system, increasing the throughput speed of production. Furthermore, you can continue to benefit from the high quality of fixed focus lenses to keep image and inspection quality at the high level you are used to.