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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. Unlike other AF-NIKKOR lenses use a focus motor in the lens, rather than a mechanical coupling from a motor in the camera.
However, the accuracy of phase-detection auto-focus depends on its effective measurement basis. If the measurement basis is large, measurements are very accurate, but can only work with lenses with a large geometrical aperture (e.g. 1:2.8 or larger). Even with high contrasty objects, phase-detection AF cannot work at all with lenses slower than ...
This list covers optical lens designs grouped by tasks or overall type. The field of optical lens designing has many variables including the function the lens or group of lenses have to perform, the limits of optical glass because of the index of refraction and dispersion properties, and design constraints including realistic lens element center and edge thicknesses, minimum and maximum air ...
As diffraction is based on aperture width in absolute terms rather than the f-stop ratio, lenses for very small formats common in compact cameras rarely go above f/11 (1/1.8") or f/8 (1/2.5"), while lenses for medium- and large-format provide f/64 or f/128.
Fisheye lens; first 600 units used a different barrel construction internally; [17] optically similar to the Minolta MC Fish-Eye Rokkor 16mm f / 2.8 (a.k.a. Leica Fisheye-Elmarit-R 16mm f / 2.8) produced up to 1981 with an optical design originally introduced in 1966/1968.
However, for the record: the first autofocus lens for a still camera was the Konishiroku Konica Hexanon 38mm f/2.8 [171] built into the Konica C35 AF (1977, Japan) 35mm point-and-shoot; the first autofocus lens for an SLR camera was the unnamed 116mm f/8 [172] built into the Polaroid SX-70 Sonar (1978, USA) instant film SLR; the first ...
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An entry-level camera, exposure mode was program AE only, with a high-speed program option, no Creative Expansion Card support. An even more basic Maxxum, this camera was basically for the point-and-shoot user that wanted a system SLR camera with interchangeable lenses and more powerful flashes, but did not want the features on, or did not want to pay for the 5000i, 7000i, 8000i cameras.