The Sublens system is a radically new approach to macro/micro imaging. It has a Variable Iris, but no f/stops. It focuses internally without any changes to its outer dimensions.
It ranges magnification from 0 to as much as 16x and can focus anywhere from infinity down to 18mm. Almost any camera up to and including those with 35mm sensors can be used with it. It is so easy to use that it literally sets the best image for you every time. Quality macro/micro imaging has become simple and easy.