OM System 12-45mm F4.0 Specs, Equivalents & Depth of Field

12–45 mm

Focal length

f/4

Maximum aperture

84°–27°

Diagonal angle of view (Four Thirds)

Four Thirds

Designed for

3.8×

Zoom ratio

Specifications#

Brand: OM System
Model: 12-45mm F4.0
Lens type: Standard zoom
Focal length: 12–45 mm
Maximum aperture: f/4
Image circle: Four Thirds (17.3×13 mm)
Mount(s): Micro Four Thirds
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 format	At 12 mm	At 23 mm	At 45 mm	Equiv. aperture (DoF)
Micro Four Thirds	24 mm · 84°	46 mm · 50°	90 mm · 27°	f/8.0

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: 14 mm f/4 on four thirds.

Focal	Aperture	at 1 m	at 2 m	at 5 m	at 10 m	Hyperfocal	Blur @2 m
12 mm	f/4	99.2 cm	10.6 m	∞	∞	2.41 m	0.1%
12 mm	f/8	5.12 m	∞	∞	∞	1.21 m	0.1%
23 mm	f/4	22.4 cm	94.5 cm	8.29 m	∞	8.84 m	0.4%
23 mm	f/8	46.6 cm	2.25 m	∞	∞	4.43 m	0.2%
45 mm	f/4	5.7 cm	23.3 cm	1.50 m	6.46 m	33.8 m	1.5%
45 mm	f/8	11.4 cm	47.0 cm	3.21 m	18.1 m	16.9 m	0.7%

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).

Body	Min. handheld shutter (longest focal)	500 rule at 12 mm	NPF at 12 mm, f/4
Micro Four Thirds	1/100 s	21 s	20 s

Compatible cameras#

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

Adapt it to other systems#

Sony E-mount Nikon Z Fujifilm X-mount Canon EF-M Hasselblad XCD Nikon 1 (CX)Pentax Q

Similar lenses#

Olympus M.Zuiko Digital ED 12-40mm f/2.8 Pro f/2.8
Olympus M.Zuiko Digital ED 12-45mm f/4.0 Pro f/4
Olympus M.Zuiko Digital ED 12-50mm f/3.5-6.3 EZ f/3.5–6.3
Panasonic G Vario 12-32mm f/3.5-5.6 Asph. Mega OIS f/3.5–5.6
Panasonic G Vario 12-60mm f/3.5-5.6 Asph. Power OIS f/3.5–5.6
Panasonic G X Vario 12-35mm f/2.8 Asph. Power OIS f/2.8
Panasonic G X Vario 12-35mm f/2.8 II Asph. Power OIS f/2.8
Panasonic Leica DG Vario-Elmarit 12-60mm f/2.8-4.0 Asph. Power OIS f/2.8–4
Olympus M.Zuiko Digital 14-42mm f/3.5-5.6 II f/3.5–5.6
Olympus M.Zuiko Digital ED 14-42mm f/3.5-5.6 f/3.5–5.6
Olympus M.Zuiko Digital ED 14-42mm f/3.5-5.6 EZ f/3.5–5.6
Olympus M.Zuiko Digital ED 14-42mm f/3.5-5.6 II R f/3.5–5.6

Frequently asked questions#

Is the OM System 12-45mm F4.0 full frame?

No — it is designed for Four Thirds sensors.

What is the OM System 12-45mm F4.0 equivalent to on APS-C?

Its focal length is already the real value for Four Thirds: 12–45 mm frames like 24–90 mm on full frame.

What is the OM System 12-45mm F4.0 good for?

As a standard zoom it suits everyday shooting, travel, events and walkaround use.

Sources & licences#

Lensfun lens database — CC BY-SA 3.0

OM System 12-45mm F4.0