Sony 28-60 + WWL-1 / WACP- C Vignette

The 28-60 has distortion correction set to on and can't be switched off in camera

However you can turn that off in lightroom and the lens shows vignette afterwards

This is hood vignette

When I use the WACP-C at distance closer than the recommended extension i get vignette on the rear lens not the hood

I believe the flat port 45 is 3mm too long and as result you have this problem

Looking to the amount of distortion the lens has by itself I think the lens field of view uncorrected is in effect wider than what a 28mm lens would have

the reason why I disable lens correction for distortion is because it improves the edge performance when used on a curved adapter. As the image is not straight anyway it makes sense to do so

Obviously a small lens like this has many compromises baked in distortion and vignetting are very strong so it is assumed you use the lens correction but I only really use chromatic aberration correction that can't be switched off