Nikon AF Nikkor 50mm f/1.4D

Shoot this lens wide open at f/1.4 and the whole frame goes soft and glowy, a veil of spherical aberration lifting the blacks and wrapping highlights in halation. That look divides people. Stop down to f/2.8 and the softness clears and the frame tightens up; by f/5.6 it is genuinely sharp corner to corner. That swing from hazy wide open to crisp stopped down is the defining trait of the 50mm f/1.4D, and it is why some photographers keep one around specifically for an f/1.4 rendering a clinical modern fifty will not give them.

The optical formula is a classic double-Gauss, seven elements in six groups, a layout closely related to the manual-focus Ai-S 50mm f/1.4 that preceded it. This is not an exotic lens. It is the standard normal, the one that came bundled with countless film bodies and lived in countless bags. The D in the name means it reports focus distance to the body for 3D matrix metering and flash; optically it is a familiar double-Gauss, close in character to the manual-focus 50mm f/1.4 it descends from.

Bokeh wide open is smooth but not perfectly neutral. Out-of-focus highlights can pick up slightly nervous edges, and the seven-blade diaphragm turns them into heptagons once you stop down past f/2. Contrast is moderate, color sits in the neutral, faintly warm Nikon register, and flare is well controlled for a fifty of this vintage, though strong backlight straight into the front element will still wash it out a touch. Field curvature is mild. Most people run it as a portrait and walk-around lens, sometimes as a low-light street option where f/1.4 buys about two-thirds of a stop over the cheaper f/1.8.

The plain weakness is that wide-open softness. If you want a fifty that is crisp at f/1.4, look elsewhere; the AF-S 50mm f/1.4G or a Sigma Art will out-resolve it without trying. The screwdriver autofocus is slow and audible, and it does not focus at all on bodies without a built-in AF motor, meaning the entry-level DX cameras and the Z series via adapter. On film F-mount bodies none of that comes up.

Used prices today sit near the bottom of the range, and people still reach for this one over the cheaper f/1.8D for the extra two-thirds stop and the wide-open rendering. When you do open it up in dim light, meter wide open at f/1.4 in Zone Light Meter so the exposure matches the aperture you are actually shooting; stopping down to f/16 for the reading and then opening back up will hand you an overexposed frame. The 52mm filter thread is the old Nikon standard, so screw-in NDs and polarizers swap freely across the rest of a Nikkor kit.