Compare lenses

Olympus M.Zuiko 12-45mm f/4 PRO vs OM System M.Zuiko 12-40mm f/2.8 PRO II

The Olympus M.Zuiko 12-45mm f/4 PRO and the OM System M.Zuiko 12-40mm f/2.8 PRO II side by side, computed from this guide's catalogue.

Which to pick

Pick the Olympus M.Zuiko 12-45mm f/4 PRO if you want a lighter lens (254 g against 382 g). Pick the OM System M.Zuiko 12-40mm f/2.8 PRO II if you want a brighter f/2.8 (1.0 stops more light), for dim light and softer backgrounds.

Still torn? Ask the guide about the Olympus M.Zuiko 12-45mm f/4 PRO and the OM System M.Zuiko 12-40mm f/2.8 PRO II

Specs side by side

Rows that differ are in full colour; the better value is marked where one is better by any measure.
Spec	Olympus M.Zuiko 12-45mm f/4 PRO	OM System M.Zuiko 12-40mm f/2.8 PRO II
Maker	Olympus	OM System
Focal length	12-45mm (zoom)	12-40mm (zoom)
Full-frame equivalent	24-90mm on Micro Four Thirds	24-80mm on Micro Four Thirds
Maximum aperture	f/4	f/2.8brighter
Made for	Micro Four Thirds	Micro Four Thirds
Mounts	Micro Four Thirds	Micro Four Thirds
Stabilised	no	no
Autofocus	yes	yes
Zoom range	3.8×more range	3.3×
Weight	254 glighter	382 g
Cameras it fits	49 in this guide	49 in this guide

Focal range, in full-frame terms

Olympus M.Zuiko 12-45mm f/4 PRO: 12-45mm on Micro Four Thirds, like 24-90mm.

OM System M.Zuiko 12-40mm f/2.8 PRO II: 12-40mm on Micro Four Thirds, like 24-80mm.

Aperture

Olympus M.Zuiko 12-45mm f/4 PRO: f/4 wide open.

OM System M.Zuiko 12-40mm f/2.8 PRO II: f/2.8 wide open.

Each opening drawn to scale against f/1.4: a smaller f-number lets in more light and blurs the background more.

Field of view

How wide each sees, at each end, on the sensor it was made for.

Cameras they fit

49 cameras in this guide take both, so either works on the same body.