Data sheet: Nikkor Ai 50 mm f/1.4

Pekka Buttler, 08/2022


The table below summarizes the lens’ key specifications:

Brand:Nikon (Nikkor)Lens name50 mm 1:1.4
Focal length(s)150 mmAngle-of-view246°
Maximum Aperturef/1.4In Production1977–1981
Lens mountNikon FSubfamily (if applicable)Ai (Automatic indexing)
Length340,0 mmDiameter463,5 mm
Filter ring diameter52 mmWeight254 grams
Lens element count7Lens group count6
Aperture blades (S/R/C)57 SFocus throw210 °
Minimum focusing distance45 cmsMaximum magnification1:6,8
Has manual aperture ringYESHas Manual focus ringYES

Further notes:
• While this lens is in several respects nothing special (all Japanese even moderately self-respecting camera companies offered fast fifties), Nikon managed to manufacture more than 900 000 copies of this lens in just over four years. This equates to about 1000 copies made every working day.

History (when relevant)

Nikon is undoubtedly one of the great names in 35 mm SLR photography. The Nikon F mount has been in continuous production since 1959. During that time, the mount has developed/changed in some detail, however without ever fully sacrificing compatibility.

In short (a longer version is here), the development of Nikon’s SLR lenses can be traced as follows:
• 1959–1977: Pre-Ai. Manual focus lenses that use ‘rabbit ears’ to communicate selected aperture with the camera body.
• 1977–1986: Ai and Ai-s. Manual focus lenses that may have ‘rabbit ears’ for backward compatibility, but are designed to communicate selected aperture with the camera body through indentations in base of aperture control ring.
• 1986–today: AF and AF-D. Autofocus lenses that do not have a focusing motor within the lens, but rely on the focus motor within the camera. All AF and AF-D lenses are simultaneously Ai-s lenses (they are Ai-s lenses extended with AF) 6
• 1996–today AF-S and AF-P. Autofocus lenses that have an internal focusing motor and do not rely on the body having a focusing motor.

While Nikon (alike many competitors) started out with a longer-than-50 mm f/1.4 offering, the design of the fast standard lens was revised to 50/1.4 in march 1962. After first manufacturing two somewhat different F-type 50/1.4, Nikon went on to produce a C-type as well as two K-type 50/1.4’s before introducing this Ai-variant. Also, some of these redesigns were more than mere cosmetic changes, even though the primary design (7 elements in 6 groups, advanced planar / double-gauss) remained the same throughout.


Besides adapting, this lens can be used natively on all current high-end Nikon dSLRs and several earlier medium-to-high-end older Nikon dSLRs7. Likewise, if it still has its rabbit ears, it can be natively used on all Nikon F-mount film cameras ever produced (without the rabbit ears, it is limited to post 1977 bodies).

Thanks to being a fully manual lens (manual aperture, manual focus), the lens can be adapted to all mirrorless cameras using a suitable dumb adapter (and such adapters are easy to find). Moreover, a large range of special adapters (helicoid adapters, tilt/shift adapters, speed boosters) for using Nikon F lenses on most mirrorless systems are available.

Using Nikon F lenses on non-Nikon SLRs and dSLRs is likewise a distinct possibility. Thanks to the relatively generous flange focal distance of the Nikon F mount (46,5 mm), adapter rings for all dSLR mounts are available as well as for a goodly portion of film-era SLR mounts. Such rings may not allow for auto aperture, but even then the lenses can be used in stop-down metering mode.


1 Focal length is (unless stated otherwise) given in absolute terms, and not in Full-frame equivalent. For an understanding of whether the lens is wide/tele, see ‘Angle-of-view’.

2 Picture angle is given in degrees and concerns the diagonal picture angle. Rule of thumb:
> 90 ° ==> Ultra-wide-angle
70–90 ° ==> Wide-angle
50–70 ° ==> Moderate wide-angle
40–50 ° ==> ‘Standard’ or ‘normal’ lens
20–40 ° ==> Short tele lens
10-20 ° ==> Tele lens
5-10 ° ==> Long tele lens
< 5 ° ==> Ultra-tele lens

3 Length is given from the mount flange to the front of lens at infinity.

4 Diameter excludes protrusions such as rabbit ears or stop-down levers.

5 S=straight; R=rounded; C=(almost)circular at all apertures.

6 There is a further sub-class of AF-D lenses called AF-I lenses that are otherwise AF-D lenses (meaning, fully Ai-s compatible), but have an internal focus motor. Only long tele lenses were made in AF-I variants.

7 As of this writing, the following Nikon dSLRs fully support Aperture priority and manual metered modes on Nikkor Ai lenses: D2, D3, D4, D5, D6, D200, D300, D300s, D500, D600, D610, D700, D750, D780, D800, D800E, D810, D850, D7000, D7100, D7200