Portrait / short tele prime · Four Thirds

Olympus M.Zuiko Digital 45mm f/1.8

The Olympus M.Zuiko Digital 45mm f/1.8 is a four thirds prime lens (45 mm, f/1.8) for Micro Four Thirds. It belongs to the portrait / short tele prime class — ideal for head-and-shoulders portraits with flattering perspective and creamy backgrounds.

45 mmf/1.8Micro Four Thirds
45 mm
Focal length
f/1.8
Maximum aperture
27°
Diagonal angle of view (Four Thirds)
Four Thirds
Designed for

Specifications#

Brand
Olympus
Model
M.Zuiko Digital 45mm f/1.8
Lens type
Portrait / short tele prime
Focal length
45 mm
Maximum aperture
f/1.8
Image circle
Four Thirds (17.3×13 mm)
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 45 mmEquiv. aperture (DoF)
Micro Four Thirds90 mm · 27°f/3.6

Depth of field & background blur#

Computed on its native Four Thirds format (CoC 15 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/1.8 on four thirds.

FocalApertureat 1 mat 2 mat 5 mat 10 mHyperfocalBlur @2 m
45 mmf/1.82.5 cm10.4 cm66.4 cm2.70 m75.0 m3.3%
45 mmf/45.7 cm23.3 cm1.50 m6.46 m33.8 m1.5%
45 mmf/811.4 cm47.0 cm3.21 m18.1 m16.9 m0.7%

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 45 mmNPF at 45 mm, f/1.8
Micro Four Thirds1/100 s6 s4 s

Compatible cameras#

Bodies in our database with a native Micro Four Thirds mount.

Adapt it to other systems#

Sony E-mountNikon ZFujifilm X-mountCanon EF-MHasselblad XCDNikon 1 (CX)Pentax Q

Similar lenses#

Frequently asked questions#

Is the Olympus M.Zuiko Digital 45mm f/1.8 full frame?

No — it is designed for Four Thirds sensors.

What is the Olympus M.Zuiko Digital 45mm f/1.8 equivalent to on APS-C?

Its focal length is already the real value for Four Thirds: 45 mm frames like 90 mm on full frame.

What is the Olympus M.Zuiko Digital 45mm f/1.8 good for?

As a portrait / short tele prime it suits head-and-shoulders portraits with flattering perspective and creamy backgrounds.

Sources & licences#

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