AF-I, AF-S and AF-P Nikkor lenses also use a focus motor in the lens, but are not compatible with the short-lived system introduced with the F3-AF. Unlike other AF-NIKKOR lenses use a focus motor in the lens, rather than a mechanical coupling from a motor in the camera. The F-501 is one of only three cameras, the others being the F3-AF and the F4, which can autofocus with the two AF-NIKKOR lenses introduced for the F3-AF, the 80 mm 1:2.8 and the 200 mm 1:3.5. The F-501 has two focus modes available, single, in which focus is established and does not change so long as the operator holds down lightly on the shutter button, and continuous, in which the lens continuously re-focuses on whatever is in the focus area.
This method is more precise than the active method, but requires more light to function. Unlike active systems, which set approximate focus based on distance to the subject, the "passive" system uses a CCD to "see" the focus subject and focus in a manner similar to a human operator. The F-501 uses a through-the-lens (TTL) "passive" phase-detection autofocus method for establishing focus. The F-501 is powered by four AAA batteries housed in the bottom of the camera body, although it can utilize AA sized batteries with an optional attachment (MB-3). Rewind is accomplished manually by a familiar rewind knob which doubled as a release for the back. Maximum film advance speed is 2.5 frames per second (frame/s) on continuous mode, but can be as slow as 1.4 frames/s depending on the status of the focus/exposure locks.
The built-in motor drive provides single (one exposure and frame advance per shutter button press) or continuous (shutter will fire and film will advance so long as the shutter button is depressed) modes. The F-501 is a 35 mm single-lens reflex camera with automatic film loading and advance, almost a first for Nikon (the F-301 was their first SLR to feature this).
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