Olympus Zuiko Auto-W 28mm f/2

Strip an OM body down to one lens for a night walk and a lot of people reach for this one. The 28mm f/2 is small, it focuses close, and it gathers enough light that you can keep shooting Tri-X handheld after the sun is fully gone. It was the wide-fast companion to the early OM-1 and OM-2 bodies, sold from the early seventies through the late eighties, and it has stayed in the conversation long after most of its rivals dropped out of it.

The draw is the f/2 aperture in a package this size. There were faster 28s, but few that disappeared into a coat pocket the way the Zuiko does. Wide open it is usable rather than crisp: the center is a touch soft and low in contrast, heavy vignetting hides corners that are quite soft, and there is field curvature you learn to work around by putting your subject off-center and letting the edges go. Stop to f/4 and the center snaps into focus. By f/5.6 to f/8 the frame is even and bitingly sharp across most of it. Olympus used a floating element design here to hold close-focus performance together, which is why the near-distance rendering stays honest instead of collapsing the way some fast wides do at minimum focus.

Color and contrast are classic Zuiko, meaning fairly neutral with a slightly cool, restrained palette that takes well to slide film. Flare control is decent for the era thanks to Olympus's multicoating, though shoot it straight into a streetlight and you will get a veiling wash and the odd green ghost. Many shooters treat that as a feature for night work. Bokeh from a 28 is rarely the point, and this one is honest about that: wide open the out-of-focus highlights go busy with bright outlining, and they only smooth out as you stop down.

This is a documentary and street lens first. The 28mm angle is the reportage standard, wide enough to put you inside a scene without distorting faces at conversational distance, and the f/2 speed is what separates it from the slower f/2.8 and f/3.5 wides that came in every starter kit. People still cross-shop it against the Nikkor 28mm f/2 AI and the Canon FD 28mm f/2, and the Olympus usually wins on size and close focus while giving up a touch of corner sharpness wide open. The honest weakness: those soft corners and the field curvature mean it is not the first choice for flat-subject work like architecture or copy stand. For that, stop down and accept it, or pick a slower 28 built flatter.

One metering note. Shooting this wide open in low light is exactly where it earns its keep, and an OM body meters through the lens and accounts for the aperture you have set, so a separate reading from Zone Light Meter at f/2 lets you check shadow placement before you commit. Mind the filter ring if you carry NDs or grads: OM thread sizes are mixed across the system, so a single filter set is hit-or-miss across a bag of Zuiko glass. Prices have crept up as the OM system found a second life, but it is still cheaper than the German fast wides and a genuinely small way to carry f/2 at 28mm.