>>3926137Because lens designs have to make compromises, one of the most common is balancing vignette shooting wide open, and distortion with sharpness and contrast.
As we can fix vignette, contrast & distortion on import, but can't fix a lack of resolution, the obvious choice is to choose vignette. Especially on a portrait lens.
And 2ev really isn't much at all, remember this is shooting wide open a f1.8, the canon RF 24-70 2.8 has -3 EV in the corners, and that lens is well over a stop slower to start with! Whilst the vignette figures are higher than you may be used to seeing from lenses designed for film, where fixing vignette and distortion is almost impossible, we also have MUCH higher resolution lenses, especially as you move away from the centre of the lens. This is modern lens design, if you don't like it then you can still use your old low resolution DSLR lenses, don't be surprised when your shots come out very underwhelming though, resolution and contrast is what gives images that 3D pop.
Think of the photos you've taken, how many have been spoilt by too much noise in the corners after fixing a vignette? I think for me after shooting digital since the first 5d, I don't think I've EVER encountered issues with noise in corners from vignette. Now think how many have smeared details in the corners or other issues with resolution!
It's great to see brand new photographers asking questions about optics, do you have any more?
