Nikon F-401 (1987–1989)

Name: Nikon F-401
Brand: Nikon

Nikon's first SLR with the autofocus motor built into the body. It was a plastic-bodied beginner's camera, and it changed the direction of the F-mount line.

Overview

Nikon had been dodging one question for two years: what does a beginner's autofocus SLR look like when the motor lives inside the body instead of hanging off the bottom? The F-401 was the answer. It arrived in late 1987, sold as the N4004 in North America and known in some regions by that name alone. It was Nikon's first SLR with a built-in AF motor, and collectors still treat it as the point where the company stopped treating autofocus as a bolt-on accessory and started designing around it.

The F-401 was never the flagship. It sat beneath the pro-grade F3 and the more advanced F-501 (N2000), in the "beginner's SLR" slot - the body you handed someone stepping up from a compact, not the one a working photographer carried as a second. The polycarbonate shell was a departure from Nikon's traditional metal-bodied professional models. It kept the camera light at a time when "serious" still meant "heavy." A single 2CR5 lithium battery runs everything, and owners report roughly 15-20 rolls of life from one cell under regular use.

The F-401 gives you a working early-autofocus camera with real F-mount flexibility behind it. The AF is single-servo only, driven by a passive phase-detection sensor, with focus confirmation in the viewfinder and a mechanical screw in the lens mount turning the glass. It is not fast. But it works without add-ons, and it accepts the lenses people already owned.

Key Features

In-Body Autofocus With a Screw-Drive Mount

The headline feature is the autofocus motor inside the camera body rather than in an external drive unit. Autofocus is single-servo only, using a passive phase-detection sensor and confirming focus in the viewfinder. The drive itself is a mechanical screw in the lens mount. Collectors note that screw-drive AF is slower than what the competition was fielding at the time, a fair criticism, though the camera was still usable. When the drive shaft gets dirty or misaligned, that modest AF speed gets worse, so a clean mount is the first thing to check on any used example.

Pop-Up TTL Flash With Balanced Fill

The built-in flash deploys automatically in low light or on manual activation, and it meters through the lens with a guide number of GN 12 at ISO 100 (meters). Nikon's documentation for the period describes the camera as compensating exposure with automatic balanced fill-flash. That is useful on a beginner body, since the flash tries to blend with ambient light rather than blowing out the foreground. The mechanism is also the camera's most notorious failure point: the pop-up often refuses to deploy, usually from broken gears or weak springs. Test the flash latch before handing over money.

Center-Weighted Metering With a 6% Center Emphasis

Metering is TTL center-weighted with a 6% center emphasis. That is a tighter center bias than the broad averaging some competitors used, so the meter is decisive about the middle of the frame. One period source describes the circuit as a triple-sensor meter covering roughly EV1 to EV19, though that range appears in only a single source and should be treated as indicative rather than confirmed. The same caution applies to the claim that the camera reads DX-coded cartridges from ISO 25 to 5000. It's plausible and widely repeated, but it hasn't been independently corroborated. Aging CdS cells are a known weak point, and erratic metering on a used body is common enough that it's worth budgeting for.

Exposure Modes: Aperture-Priority, Manual, and Flash-Only Program

Exposure control is narrower than the mode dial might suggest. The F-401 offers aperture-priority auto and manual, with program auto available only in flash mode. That catches out shooters expecting a full program line. There is no exposure compensation dial at all; the camera leans on its automatic balanced fill-flash to handle difficult contrast instead. For a beginner's body that's a defensible simplification, but anyone used to dialing in a third of a stop will find it frustrating.

Viewfinder and Handling

The viewfinder is a fixed pentamirror with 0.85x magnification and 90% coverage, fitted with a split-image rangefinder spot surrounded by a microprism collar. Those are traditional manual-focus aids, kept even on an autofocus body. The camera is compact at 139 × 84 × 52 mm and weighs approximately 490 g with battery, light enough to carry all day. A hot shoe accepts external flash, a self-timer is built in, and there's a standard tripod thread underneath. A built-in motor drive handles film advance and rewind, though that detail comes from documentation on the closely related F-401s variant and should be read as applying to the family rather than confirmed for the base model alone.

Lens Compatibility — and the AI Question

Here the record gets muddy. The F-mount is listed as compatible with AI, AI-S, and AF lenses, but at least one dealer source states flatly that the camera doesn't support Nikon AI lenses. No authoritative document in the available record resolves that contradiction. What is documented is a specific exclusion list: the body was designed for AF Nikkor lenses except the AF-Nikkor 80mm f/2.8, the 200mm f/3.5 IF-ED, and the Autofocus Converter TC-16/TC-16A. Treat the broad AI/AI-S claim with caution and test any manual-focus lens before relying on it. Separately, period flash documentation notes that TTL auto flash operation isn't possible with the F-401, so external flash work defaults to manual. That's a real limitation for anyone planning to build a lighting setup around the body.

Historical Context

Minolta had already set the market alight. The Maxxum 7000 of 1985 started consumer autofocus, and Nikon's first answer, the F-301 (N2020), relied on an external motor drive that was bulky and costly. The F-401 was the correction: a compact, self-contained AF body aimed at the everyday shooter. It was, by one account, Nikon's second true AF SLR after the F-501, and it entered a crowded field against the Canon EOS 650, the Minolta Maxxum 3000i, and the Pentax SFX.

Nikon's choice to stick with the F-mount meant sacrificing some optical innovation for backward compatibility. Reviews praised its build and ease of use; enthusiasts dismissed it as underpowered. The line moved quickly: the F-401s (N4004s) arrived in 1989 with program mode and better handling, a second update followed in 1991 as the F-401x, and production reportedly continued until 1998, when the Nikon F60 superseded it. Nikon would carry many of the improvements forward into the F4 and F-801. The F-401 itself sits in the transitional period between Nikon's traditional manual-focus SLRs and its later autofocus film cameras.

Collectibility & Value

The F-401 isn't rare. Nikon built plenty between 1987 and 1989, but finding one in full working order is getting harder. A working example typically trades for $50 - $100, and original boxes, manuals, or accessories can nudge the price up slightly. Listings on the auction sites bear this out: a near-mint F-401 QD with the AF Nikkor 35-70mm f/3.3-4.5 has been observed around $94, and a kit listing clearly labeled as an F-401 with a third-party lens went for around the same. Several listings circulating under the F-401 banner are actually F-401X, F-401S, or F-401 QD variants, which are different cameras and should be priced accordingly. Untested "as-is" bodies turn up cheap, and at least one owner has admitted paying £1.50 for one.

The failure modes are well known: seized shutters, degraded light seals, and flash mechanisms that refuse to pop. Shutter lag, erratic metering from aging CdS cells, and a pop-up flash that won't deploy because of broken gears or weak springs are all common. The autofocus slows down when the drive shaft is dirty or misaligned, and because the body isn't sealed, moisture and dust creep in and corrode things from the inside. Shutter or AF repairs demand precision and belong with a technician; DIY work is limited to light seal swaps, contact cleaning, and basic inspection. Parts are scarce, though donor bodies surface often enough. The 2CR5 battery is still available but pricey, and some shooters swap in CR123A adapters to cut the running cost.