The exelon 4x50 night vision monocular with a super tube is a professional device with enhanced image quality through the entire field of view a unique optical arrangement of the objective lens coupled with a new specially designed tube of a new type has contributed to the high resolution and lack of distortion through the entire field of view this unit operates both in the passive mode without man made sources of light and in the active mode with the ir illuminator on the exelon 4x50