Minolta MC Tele Rokkor-PF 100mm f/2.5

Minolta built an 85mm f/1.7 that collectors chase, and this 100mm quietly outshoots it for faces. People who own an SRT or an X-700 tend to skip past it on the way to the faster glass, which is a mistake. Wide open at f/2.5 it is already usable, and it gets clearly sharper a stop down, but the wide-open frame holds the eye crisply while the ears and shoulders drop into smooth defocus. For half-length portraits that is the exact balance you want.

The bokeh is the reason most people keep it. Out-of-focus highlights render as clean, slightly soft discs without the busy edges or onion rings you get from cheaper teles. Backgrounds fall away gently instead of breaking up. Contrast sits a touch below a modern multicoated lens, which on color film reads as warm midtones and skin that does not look clinical. Stop down to f/5.6 or f/8 and it sharpens into a genuinely capable detail and landscape lens, holding well into the corners on 35mm. Field curvature is mild, the focus falloff is gradual rather than abrupt, and flare stays in check as long as you keep the sun off the front element.

Build is pure Minolta SR. All metal, dense in the hand, a long smooth focus throw, and a compact barrel that takes a common 55mm filter. The 55mm thread is shared across a big chunk of the MC and MD range, so one set of filters covers most of your kit. The coatings on this generation are simpler than modern multicoating, so a hood pays for itself outdoors. If you shoot it wide open in bright light, meter off the skin in Zone Light Meter at f/2.5 and let the reading hold; on a backlit face you want the exposure pinned to the cheek, not the background.

The honest weakness is the maximum aperture itself. At f/2.5 it sits a bit more than a full stop slower than the 85mm f/1.7, and further still behind the f/1.4 fifties, so for dim interiors or hand-held night work you are pushing film or dropping shutter speed. This is a daylight and golden-hour portrait lens, not a bar-at-midnight lens. The older coatings will veil if you point it straight into a light source without shading it.

Cross-shopped, the obvious rival is the Nikkor 105mm f/2.5, the portrait tele behind countless magazine covers and Steve McCurry's Afghan Girl. The Minolta gives you most of that look for a fraction of the price. Rokkor glass tends to be quiet value on the used market, and this 100mm is one of the better-kept secrets in it. For anyone already on a Minolta body it is the short tele to find first, and for adapter shooters it remains one of the strongest portrait buys around.