The Questar SZ90 is a Multi-Focal Length Lens (MFL) that is fully motorized and microprocessor controlled. It is a very portable small aperture lens providing five discrete focal lengths and five neutral density or spectral filter selections. The lens is best suited for video use and is shipped ready to connect directly to any standard C-mount type CCD camera. Visual and 35mm-photography use is also possible under certain restrictions. With some modification, various special applications in tracking and surveillance can be addressed. The Questar SZ90 is composed of the new MKIII barrel assembly, MFL multi port housing, microprocessor controlled CPU board, hand held controller and a universal A/C to D/C power supply. This unit requires 12 VDC to operate.