Nikon F3AF (1983)

Name: Nikon F3AF
Brand: Nikon

Nikon's first autofocus SLR wasn't a new camera at all - it was an F3 with a brain bolted into the viewfinder.

Overview

Pick up an F3AF and it feels exactly like an F3, because it is one. The 690-gram body has the same weather-sealed magnesium alloy chassis as Nikon's flagship professional SLR, and the lens mount is the familiar F-mount with mechanical aperture coupling. The difference is the black DX-1 finder on top. It's an interchangeable viewfinder unit that houses both the autofocus sensor and the motor drive that focuses the lens. Nikon didn't redesign the camera to add autofocus. They put the autofocus in the finder and called it a day.

Released in November 1983, the F3AF was Nikon's first commercially available autofocus-capable SLR. It arrived three years before the fully integrated Nikon F-501 (N2020). It was a limited-production adaptation rather than a standalone new model - essentially an F3 body paired with the DX-1 finder and two dedicated AF lenses. That approach reflected Nikon's commitment to its professional user base, who valued reliability and backward compatibility with decades of F-mount glass. It also created the camera's central limitation: autofocus only worked with the AF 80mm f/2.8 and AF 200mm f/3.5, both with internal focus motors. Only two autofocus lenses were ever produced for the system.

The camera was aimed at professional photographers and early adopters, particularly in photojournalism and sports photography. These were shooters who needed to keep fast-moving subjects in focus and were willing to work within the system's narrow lens options. The F3AF still appeals to Nikon historians and autofocus pioneers, not because it was the best autofocus camera of its era, but because it was the first step in a direction that would define the next two decades of SLR design.

Key Features

DX-1 Autofocus Finder

The DX-1 is the heart of the F3AF system. It's an interchangeable viewfinder unit containing the autofocus sensor and the motor drive that focuses the lens, and it uses a phase-detection system to determine focus. The manual describes it as a TTL image displacement detecting system utilizing two SPDs built into the finder. Because the autofocus lives in the finder rather than the body, the F3AF's AF system relies on a mechanical linkage from the finder to the lens. That means alignment and calibration are critical, and misalignment can prevent proper focusing entirely. The finder covers approximately 92% of the image area, according to the manual, so the final photograph will be slightly larger than what you see through the eyepiece.

The DX-1 requires four 1.5V SR44 (or equivalent 357) silver-oxide batteries, stacked in a cartridge. These are no longer manufactured in some regions, so users may substitute modern equivalents with care to avoid voltage mismatches.

Dedicated AF Lenses

Autofocus on the F3AF works only with the Nikon AF 80mm f/2.8 and AF 200mm f/3.5 IF-ED, both with internal focus motors. The system also supports focus-aid operation, using the focus indicators inside the finder, with Nikkor and Nikon Series E lenses having a maximum aperture of f/3.5 or faster. Manual focusing using the matte portion of the screen is possible with any lens. The manual notes several exceptions. Certain wide-angle and macro Nikkors with maximum apertures of f/3.5 or faster cannot be used for focus-aid operation, including the 16mm f/3.5, 20mm f/3.5, 28mm f/3.5, 135mm f/3.5, Micro 55mm f/3.5, and several PC lenses. Teleconverters that push the effective aperture slower than f/3.5 also disable autofocus and focus-aid operation.

F3 Professional Chassis

Underneath the DX-1 finder, the F3AF is a standard F3, built on the durable, weather-resistant F3 platform with mechanical reliability and long-term serviceability. The vertical-travel focal-plane shutter runs from 1/2000 sec to 1 sec, plus Bulb, and the standard F3 body can operate mechanically at 1/2000 sec without batteries. Metering and autofocus require power, but the shutter itself does not. The body measures 147 × 97 × 52 mm and weighs approximately 690 g without a battery.

Aperture-Priority AF Mode

The F3AF offers aperture-priority auto exposure alongside manual exposure. Set the camera to A, and the correct shutter speed is electronically determined to match the aperture in use. Combined with autofocus, this was a novel feature for Nikon at the time. Metering is center-weighted TTL via a silicon photodiode, with 60/40 center-weighted sensitivity. The metering cell sits in the camera body below the reflex mirror rather than in the finder, so full metering capability remains available even with an interchangeable viewfinder attached.

Interchangeable Viewfinder System

In addition to the DX-1, the F3AF accepts other interchangeable viewfinders designed for the regular Nikon F3. With them, all Nikkor and Nikon Series E lenses, including the AF-Nikkors, are usable with the F3AF body. Autofocus control, however, cannot be used with viewfinders other than the DX-1. The manual lists compatible finders including the Eyelevel Finder DE-2, High-Eyepoint Finder DE-3, Waist-Level Finder DW-3, Action Finder DA-2, and 6X Magnification Finder DW-4. When using the DA-2 or DW-3, the manual cautions that stray light can enter from the top and cause an inflated meter reading.

Historical Context

The F3AF was introduced while Japanese manufacturers raced to develop practical autofocus systems. Minolta had already announced the groundbreaking Maxxum 7000 (1985), which would soon redefine the market with integrated autofocus and electronic lens communication. Nikon took a more conservative, evolutionary approach. Rather than redesigning the F-mount or abandoning mechanical compatibility, the F3AF used an external AF module, the DX-1 finder, to retrofit autofocus onto an existing professional body.

The system's limitations were evident even at the time. Only two autofocus lenses were ever produced, and the DX-1 finder lacked the speed and accuracy of later integrated systems. But the F3AF was a critical technological stepping stone, showing Nikon's engineering capability in AF development and laying the groundwork for the eventual transition to fully electronic lenses and bodies in the late 1980s. It predated the fully integrated Nikon F-501 (N2020) by three years.

Collectibility & Value

The F3AF is a rare and sought-after collector's item because it was Nikon's first autofocus camera and had a limited production run. Complete sets, including the F3 body, DX-1 finder, and one or both AF lenses, command premium prices, often ranging from $1,200 to $2,500 depending on condition and completeness. The AF 200mm f/3.5 lens is particularly rare and can exceed $1,000 on its own. Body-only listings with the DX-1 finder have appeared in the $380 - $650 range, though these typically lack the dedicated AF lenses that make the system functional.

Buyers should verify the functionality of the DX-1 finder's autofocus motor and battery compartment before committing. Common issues include degraded rubber grips, stiff shutter mechanisms from inactivity, and oxidation in the battery contacts. The AF system relies on precise mechanical coupling between the finder and lens, so misalignment can prevent proper focusing entirely. Worn shutter curtains, degraded light seals, and sluggish autofocus response due to dried lubricants in the DX-1 finder's drive mechanism are all documented maintenance concerns. Replacement parts, especially for the DX-1 finder, are scarce.

Servicing should be performed by technicians experienced with vintage Nikon F-mount systems, particularly those familiar with the F3's modular design. Regular cleaning, battery removal during storage, and periodic function testing are recommended to maintain long-term reliability. The original owner's manual is available through archive.org.