Originally posted by repaap Umm, f 4,5 is still as fast as f 4,5 on any other format. What is effective is dof of: f 9, instead of f 4,5. On FF. It is pretty narrow still with effective 300-900 mm. Advantage is that you won’t have to stop it much down to get more Dof.
I wouldnt call a F1.8 phone lens a "fast lens" when compared to FF lenses. And we compare things here.
The equivalent very slow F9 of the Oly lens expresses both the effects on background sepation
and the effect on noise and dynamic range due to the limited light gathering capabilities (4 times less).
If you can live with the noise generated on FF by a wildlife subject or sports action at F9 then the lens is acceptable to you. If the ISO ranges forced by F9 on FF are not what you can accept then the lens is bad for you.
So for a light vacation lens/camera combo for static subjects good. Sports/wildlife: bad.
It is that simple.