Nikon AF Nikkor 50mm f/1.8D

You will find one of these in an enormous share of used Nikon kits. It was the obvious first prime to add to an N80 or an F100, it kicked around the bottom of camera bags for twenty years, got sold for forty dollars at a camera show, and still resolves better wide open than lenses costing ten times more. The AF Nikkor 50mm f/1.8D is the cheap fifty everyone learns on and a surprising number of working photographers never bother to replace.

Optically it is a six-element double-Gauss, the same general layout Nikon has used for fast fifties since the rangefinder days. Wide open at f/1.8 it is soft in the corners and a little hazy with spherical aberration that gives skin a flattering glow. Stop down to f/4 and it snaps into a sharpness that holds clear into f/8. The bokeh is the honest weakness here. With a seven-blade aperture, out-of-focus highlights go heptagonal as soon as you close down past wide open, and busy backgrounds can render nervous rather than creamy. This is not a lens you buy for melted backgrounds. You buy it because it is sharp, light, and renders color with the neutral, slightly cool Nikkor signature that sits so well on Portra and Ektar.

The "D" means it reports focus distance to the body for 3D matrix metering and flash, which matters more on film bodies than people admit. It focuses by screwdriver from the camera, so it is loud and not fast, and on bodies without a focus motor it does not autofocus at all. That is the catch buyers miss. Pair it with an FM2 or an FE and you are focusing by hand anyway, which the lens does fine thanks to a real aperture ring that lets it meter on any AI or AI-S body, from the FM2 and FE up through the F4 and F6. It has the meter-coupling ridge but no prong, so the truly old pre-AI bodies (the original F, the Photomic heads) will not meter it.

Where it lives today is the entry shelf. Street shooters who want one prime and one body reach for it. Portrait shooters on a budget use it at f/2.8 for tight head-and-shoulders. It gets cross-shopped against the older AI-S 50mm f/1.8 (better build, no autofocus) and the pricier f/1.4D (one more stop, bigger out-of-focus highlights, twice the money, and a wash on sharpness once you are both stopped down). The 52mm filter thread is shared across nearly the entire classic Nikkor line, so one set of NDs and polarizers covers your whole bag.

For exposure, the thing to remember is that f/1.8 is a real working aperture on this lens, not a marketing number. Indoors at night you can meter at full aperture and actually use it, with the understanding that the wide-open softness is part of the look. In Zone Light Meter, meter for the shadows you care about at f/1.8 and let the highlights glow; on negative film that haze reads as atmosphere, not error. Stop to f/4 when you want the corners and the resolution to come back. It is the most lens you can carry for the least money, and generations of photographers, going back to the first AF fifty in 1986, have quietly agreed.