The Nikon N90s is a 35mm autofocus SLR using Nikon's F lens mount. It was targeted toward the advanced amateur or prosumer; its feature set is comparable to that of Nikon's current D100/200/300 SLRs. The name N90s was used for marketing in the United States; everywhere else, the camera was called the F90x. This camera was also used as the base for the Kodak DCS 400 series of digital SLRs. The N90s/F90x was introduced in 1994 and discontinued in 2001. The camera's predecessor, the N90/F90, was introduced in 1992 and discontinued in 1994. The successor to the N90s was the F100 introduced in 1998. This camera takes four AA batteries that are held in with a screw through the battery compartment cover. It also has auto focus, auto film advance, auto rewind, LCD mode screen, manual mode, auto focus tracking, shutter priority auto exposure control, Aperture priority auto exposure control, DX coded film switch, frame counter, instant return type reflex mirror, standard ISO-type hot shoe contact (slow sync, rear curtain sync), Red eye reduction, flash recommended LED, flash ready LED, battery power indicator, and a thumb wheel mode plus options selector. The camera is capable of using ISO 25 to 5000 if DX coded film and ISO 6 to 6400 can be manually set. The camera has Lithium niobate oscillator-controlled shutter speeds from 1/8300 of a second to 30 seconds and electromagnetically controlled Bulb setting is provided.