Minolta's fast MC standard — the 55mm f/1.7 MC Rokkor-PF, a common well-regarded normal lens.
The Minolta MC Rokkor-PF 55mm f/1.7 is a fast standard manual-focus lens for Minolta reflex cameras from the MC generation of the mid-1960s. MC marks the meter-coupled series that added open-aperture metering to the Rokkor line. As a fast normal it was one of the common standard lenses supplied with Minolta's meter-coupled bodies.
This is a manual-focus standard lens with a 55mm focal length and a maximum aperture of f/1.7, from the meter-coupled MC line. The PF code encodes the element and group arrangement in Minolta's scheme. Only the focal length and aperture are affirmed; other construction figures for this common lens are not confirmed here and are omitted.
The 55mm focal length gives a natural, slightly long normal field that suits general shooting, casual portraits and street work. The fast f/1.7 aperture provides good low-light capability and pleasant subject separation, and MC-era Rokkor standards are well regarded for balanced, neutral rendering across the frame.
On the used market this is a common, affordable and reliable MC standard Rokkor, popular with collectors and mirrorless adapters. Given its age, inspect for haze, fungus and separation, confirm the aperture is oil-free and snappy, and check the focus helicoid for smooth travel. Look over the coatings for cleaning marks, and use an adapter for mirrorless mounting.