Olympus Zuiko Auto-W 21mm f/2

Olympus made the world's first 21mm f/2 and then did the harder thing: they got it down to about 250 grams, a body that nearly vanishes on the front of an OM-1. Everyone else's fast ultrawides from that era were tanks. Yoshihisa Maitani had built the whole OM system around pro glass that did not weigh like a brick, and this lens is that idea pushed to its limit. Olympus already had a perfectly good 21mm f/3.5, a compact little wide, but the f/2 was the flagship statement, and it fit in a jacket pocket.

The formula is 11 elements in 9 groups, retrofocus by necessity at this focal length, with a floating group that shifts as you focus close. That floating element is the part that earns its keep. Most super-wides smear into mush at the edges near minimum focus, and the floating design holds the corners together when you get in tight. Wide open at f/2 the center is sharp, more than its 1970s pedigree would suggest, and contrast holds up well. Stop down to f/2.8 and the corners catch up quickly. Color is clean. Distortion stays modest for a 21mm.

It is not flawless, and the people who love it tend to love the flaws. Point it into a bright source and it veils, throwing soft halation and the odd ghost across the frame. Call that flare-prone if you want. The cine crowd calls it character. OM Zuiko primes get rehoused for video constantly, this 21mm among them, prized for exactly that rendering, and the combination of that demand and real scarcity is most of what pushed prices up. This is not a lens you buy on a whim anymore. Clean copies trade in the low-to-mid four figures, the kind of money that used to mean Leica, and they move at that price regardless.

So who reaches for it. Anyone working wide in cramped, dim rooms: architecture and interiors where you cannot step back, indoor reportage, low-light street, the occasional star field. The f/2 is the entire point, so shoot it open. Meter wide open in the dark and let Zone Light Meter place your shadows where you want them. At f/2 on a 21mm you still have usable depth of field even up close, so you are not chasing focus the way you would with a fast fifty wide open. The 55mm thread takes standard screw-in filters if you want an ND to keep that f/2 look going in daylight.

The honest weakness, past the flare that some buyers actively want, is mechanical and economic. These are forty-plus years old, and the floating helicoid can stiffen or seize. A smooth-focusing copy commands a premium and a gritty one is a gamble. The rational cross-shop is a modern mirrorless 21mm that will out-resolve it on a chart and cost less. People pay the OM tax regardless, for the rendering, the size, and the fact that Olympus only ever made this one 21mm f/2.