 It is based on a Nikon F80 (N80 in the U.S.) viewfinder, shutter, mirror-box and autofocus modules surrounded by a Fujifilm body that includes its own proprietary CCD image sensor and electronics, and a vertical grip shutter release.It has a Nikon F lens mount and can use most lenses made for 35 mm Nikon SLR cameras, but only with manual operation with Nikon AIS lenses, unusually for a digital SLR the S3 Pro can be used with a manual cable release.It is autofocusing and has an electronically controlled focal plane shutter with speeds from 30 sec.