Compare lenses

Olympus M.Zuiko 45mm f/1.8 vs Yongnuo YN42.5mm f/1.7M II

The Olympus M.Zuiko 45mm f/1.8 and the Yongnuo YN42.5mm f/1.7M II side by side, computed from this guide's catalogue.

Which to pick

On these specs they are close to even: hold both if you can, and let the price, the handling and the lenses you want decide.

Olympus M.Zuiko 45mm f/1.8: 45mm on Micro Four Thirds, like 90mm.

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

Olympus M.Zuiko 45mm f/1.8: f/1.8 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.

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

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