Minolta's economy standard — the 55mm f/2 Auto Rokkor-PF, an early SR-system normal lens.
The Minolta Auto Rokkor-PF 55mm f/2 is a standard manual-focus lens for Minolta reflex cameras from the late 1950s, part of the early SR-system range. The Auto prefix denotes its automatic diaphragm, and this slightly slower sibling to the f/1.8 version served as an economical normal lens for everyday photography on Minolta's first reflex bodies.
This is a manual-focus standard lens with a 55mm focal length and a maximum aperture of f/2. The PF code encodes the element and group configuration in Minolta's scheme. Beyond the verified focal length and aperture, precise construction data for this model is not confirmed here and is left out rather than guessed.
The 55mm focal length provides a natural perspective close to normal vision, comfortable for general subjects, casual portraits and street photography. A maximum aperture of f/2 gives useful low-light latitude and gentle background blur while keeping the lens compact, with rendering typical of late-1950s Rokkor optics.
On the used market this is a common and inexpensive early standard Rokkor, of interest to collectors and adapters of vintage lenses. Given its age, inspect for haze, fungus and separation, check the aperture blades are clean and responsive, and confirm the focus helicoid turns smoothly. Look for coating wear, and remember an adapter is needed to mount it on mirrorless cameras.