Standard prime · Full frame

Nikon Nikkor AI 55mm f/1.2

The Nikon Nikkor AI 55mm f/1.2 is a full frame prime lens (55 mm, f/1.2) for Nikon F. It belongs to the standard prime class — ideal for street, documentary, everyday and low-light shooting.

55 mmf/1.2Nikon F
55 mm
Focal length
f/1.2
Maximum aperture
43°
Diagonal angle of view (Full frame)
Full frame
Designed for

Specifications#

Brand
Nikon
Model
Nikkor AI 55mm f/1.2
Lens type
Standard prime
Focal length
55 mm
Maximum aperture
f/1.2
Image circle
Full frame (36×24 mm)
Mount(s)
Nikon F
Projection
Rectilinear
Lensfun correction profile
Yes — distortion/vignetting/TCA

Equivalent focal length on different cameras#

Field of view and depth-of-field equivalence when this lens is used on bodies with different sensor sizes (natively or via an adapter).

Camera formatAt 55 mmEquiv. aperture (DoF)
Full frame55 mm · 43°f/1.2
APS-C82 mm · 29°f/1.8
APS-C (Canon)88 mm · 27°f/1.9
Micro Four Thirds110 mm · 22°f/2.4

Depth of field & background blur#

Computed on its native Full frame format (CoC 30 µm). “Blur @2 m” is the size of an out-of-focus point at infinity, as a percentage of frame width, with the subject at 2 m — a simple bokeh index. Full table: 50 mm f/1.2 on full frame.

FocalApertureat 1 mat 2 mat 5 mat 10 mHyperfocalBlur @2 m
55 mmf/1.22.2 cm9.3 cm59.1 cm2.40 m84.1 m3.6%
55 mmf/47.5 cm31.0 cm2.04 m9.34 m25.3 m1.1%
55 mmf/815.1 cm63.2 cm4.64 m41.8 m12.7 m0.5%

Handheld & night-sky limits#

NPF assumes typical 20–24 MP sensors (≈6 µm pixels on full frame, ≈3.9 µm on APS-C, ≈3.3 µm on Micro Four Thirds).

BodyMin. handheld shutter (longest focal)500 rule at 55 mmNPF at 55 mm, f/1.2
Full frame1/60 s9 s4 s
APS-C1/80 s6 s3 s
APS-C (Canon)1/80 s6 s3 s
Micro Four Thirds1/100 s5 s3 s

Adapt it to other systems#

Frequently asked questions#

Is the Nikon Nikkor AI 55mm f/1.2 full frame?

Yes — it covers the full 36 × 24 mm frame.

What is the Nikon Nikkor AI 55mm f/1.2 equivalent to on APS-C?

On a 1.5× APS-C body it frames like 82 mm, and like 88 mm on Canon APS-C.

What is the Nikon Nikkor AI 55mm f/1.2 good for?

As a standard prime it suits street, documentary, everyday and low-light shooting.

Sources & licences#

Last updated October 03, 2026 · How we calculate · Sources

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