Minolta's first-generation standard — the 55mm f/1.8 Auto Rokkor-PF from the late 1950s SR system.
The Minolta Auto Rokkor-PF 55mm f/1.8 is a standard manual-focus lens for Minolta reflex cameras from the late 1950s, from the first generation of the SR system. The Auto prefix marks it as an automatic-diaphragm design, and as a fast normal lens it was one of the everyday standard optics supplied with early Minolta bodies for general photography.
This is a manual-focus standard lens with a 55mm focal length and a maximum aperture of f/1.8. The PF designation encodes the element and group arrangement in Minolta's naming scheme. Only the focal length and aperture are stated as verified; other build details for this early model are not confirmed and are therefore not included.
At 55mm the lens gives a natural field of view close to normal, well suited to general shooting, environmental portraits and street work. The f/1.8 maximum aperture allows work in lower light and some subject separation, while the rendering reflects the coating and design conventions of the late 1950s rather than later multi-coated Rokkors.
On the used market this early standard Rokkor is fairly common and affordable, popular with Minolta collectors and those adapting vintage glass. Because of its age, check for haze, fungus and separation, confirm the aperture blades are oil-free and quick, and make sure the focus ring is smooth. Examine the single coating for wear, and note it requires an adapter for use on mirrorless bodies.