Leica Elmarit-M 28mm f/2.8 (v4)

Set this beside the Zeiss Biogon 28mm f/2.8 ZM and you get two answers to the same question. The Biogon is the flatter, higher-contrast, slightly clinical wide that gets the geometry dead straight. This Elmarit, the fourth version, built from 1993 and kept in the catalog into 2011 even after the aspherical Elmarit arrived to eventually replace it, is the one you reach for when you want the corners to fall away a little and the contrast to breathe. It was the last 28mm Leica made before the aspherical era, and that pre-ASPH character is exactly why it still has a following.

Wide open at f/2.8 the center is already sharp, genuinely sharp, but the edges go soft and there is visible field curvature pulling the corners back. Stop down to f/5.6 and the frame tightens up everywhere. By f/8 it is even across the whole image, and that is where most street and documentary work lives anyway. The rendering is the draw. Out-of-focus areas stay calm instead of getting busy, microcontrast gives skin and stone real texture, and the falloff from sharp to soft is gradual rather than the abrupt cutoff a more corrected modern design hands you. Color is neutral with a faint warmth that plays well with most films.

The 28mm focal length on a 35mm body is the documentary wide, the one you set to f/8, zone-focus to two meters, and forget. Wide enough to put you inside a scene without the stretched edges of a 24mm. Tight enough to keep verticals honest. This is reportage and street glass first, environmental portraiture second. The 46mm filter thread is small and cheap to feed, which matters when you run a yellow or orange filter on black-and-white all day, or a polarizer for skies.

The honest weakness is vignetting wide open. At f/2.8 the corners go noticeably dark, more than the ASPH that replaced it. On slide film at full aperture you will see it. (The Biogon falls off wide open too, so this is not a Leica failing so much as a fast 28mm reality.) Stopped down past f/4 it mostly clears, but if you shoot a lot of even-toned skies at f/2.8 this lens will remind you it was designed before software profiles existed to paper over the falloff.

Where it sits now is the value pick in the Leica 28mm lineup. The ASPH v5 corrects the corners and kills most of the vignetting and costs a good deal more used. The Biogon delivers similar sharpness for less money but with a cooler personality and a longer barrel. The v4 holds its place because it is compact, mechanically excellent, and renders with a character the corrected lenses sanded off. One metering note. Because the corners darken wide open, meter off your subject in the central field rather than averaging the whole frame at f/2.8, and let Zone Light Meter place that reading where you want it on the curve. The vignette is a look, not an exposure error, so do not chase it with compensation.