Compare lenses

Olympus M.Zuiko 45mm f/1.2 PRO vs Yongnuo YN42.5mm f/1.7M II

The Olympus M.Zuiko 45mm f/1.2 PRO and the Yongnuo YN42.5mm f/1.7M II side by side, computed from this guide's catalogue.

Which to pick

Pick the Olympus M.Zuiko 45mm f/1.2 PRO if you want a brighter f/1.2 (1.0 stops more light), for dim light and softer backgrounds. On these specs the Yongnuo YN42.5mm f/1.7M II has no clear advantage: choose it if the price, the handling or a lens you own decides it.

Still torn? Ask the guide about the Olympus M.Zuiko 45mm f/1.2 PRO and the Yongnuo YN42.5mm f/1.7M 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 45mm f/1.2 PRO	Yongnuo YN42.5mm f/1.7M II
Maker	Olympus	Yongnuo
Focal length	45mm (prime)	42mm (prime)
Full-frame equivalent	90mm on Micro Four Thirds	85mm on Micro Four Thirds
Maximum aperture	f/1.2brighter	f/1.7
Made for	Micro Four Thirds	Micro Four Thirds
Mounts	Micro Four Thirds	Micro Four Thirds
Stabilised	no	no
Autofocus	yes	yes
Weight	410 g	not listed
Cameras it fits	49 in this guide	49 in this guide

Focal range, in full-frame terms

Olympus M.Zuiko 45mm f/1.2 PRO: 45mm on Micro Four Thirds, like 90mm.

Yongnuo YN42.5mm f/1.7M II: 42mm on Micro Four Thirds, like 85mm.

Aperture

Olympus M.Zuiko 45mm f/1.2 PRO: f/1.2 wide open.

Yongnuo YN42.5mm f/1.7M II: f/1.7 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.