Canon FD 50mm f/1.8

This is the most common Canon lens on earth, and that is exactly why it is underrated. Canon built it into millions of FD kits across the 1970s and into the 80s, most famously bundled with the AE-1, so it floods every used bin and costs almost nothing today. People walk past it reaching for the f/1.4 and assume the faster lens is the sharper one. It is, wide open. But by f/4 the gap closes to nothing, and the corners on the f/1.8 are effectively as clean as the f/1.4 at the same setting. The speed premium buys you a stop and a little more rendering character, not meaningful resolution at working apertures. The f/1.8 also weighs less in the bag.

Optically it is a textbook double-Gauss, six elements in the standard fifties layout, and Canon carried it through three versions. The chrome-nose breech-lock original arrived in 1971, already S.C. coated. The black-ring breech-lock S.C. followed around 1973. Then the New FD bayonet-mount version landed in 1979, when Canon dropped the rotating breech collar for a quick-twist bayonet across the whole nFD line. The S.C. (Spectra Coating) ran through every generation of this 50, which is unusual, since most FD lenses moved to the better S.S.C. multicoating. Wide open at f/1.8 there is a slight veiling glow that softens skin and irritates anyone shooting test charts. Stop to f/4 and it snaps into proper sharpness across the frame. By f/5.6 to f/8 it is as crisp as anything Canon made that decade, with honest contrast and clean edges.

The background rendering stays smooth and unfussy rather than swirly or busy, with rounded blur that only turns harsh when a bright specular point catches the diaphragm at small apertures. Color is neutral, slightly warm on the coated copies. Its real weakness is flare. Shoot the older single-coated barrel into a low sun without the hood and it throws a milky veil that flattens contrast and ghosts the highlights. A cheap 52mm hood kills most of it, and the same 52mm thread takes ND or a polarizer for almost nothing, since the bulk of the FD system shared that filter size.

Who shoots it: everyone learning a film SLR, and plenty who never moved on. The flat field and 0.6m close focus make it a genuine general walkaround optic, good for street, casual portraits, and documentary work where you want one small lens and no anxiety. It is light, it is tough, and you do not panic if it gets rained on or knocked around.

The f/1.8 maximum aperture is the entire reason to own it, and that is where one habit pays off in dim rooms or at dusk. Meter wide open. Read the scene at f/1.8 with Zone Light Meter to place your shadows, then decide whether you actually want that depth of field or whether to stop down and drop the shutter speed to match. When the light is failing, the wide-open reading is the one that tells you where you really stand.

People still cross-shop it against the Canon FD 50mm f/1.4 and the Nikkor 50mm f/1.8, and the answer almost always comes down to budget. The f/1.4 costs several times more for that extra stop and a touch more character. If you want a sharp, durable, dirt-cheap standard lens for an FD body, the f/1.8 remains the obvious pick.