The Vision Engineering MTO104 4x Mantis Objective Lens is for use with the IOTA Microscopes. To ensure the highest image quality for the user, each lens is tailored to the Mantis system, combining finest optical quality glass and special coatings to give a high resolution, high contrast view. The Mantis IOTA microscope system has an interchangeable lens interface. Rotate the lens to the right to lock it in place and rotate it to the left to unlock and remove the lens.