Well regarding the Adapter quality, i would rate the hcam at 9/10 and the kipon at 5/10 (i have some little play In all part).
so i bought a secondhand mirex hasselblad to eos.
I
Regarding the vigneting it depends on the lens, more precisly on how the lens is designed ... on my examples 24 tseii and pentax55 for both it is a mechanical vignet from the adapter, the 35pc distagon vigneting is coming from image circle (in fact Front ring Of the lens)...
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so i bought a secondhand mirex hasselblad to eos.
I
Regarding the vigneting it depends on the lens, more precisly on how the lens is designed ... on my examples 24 tseii and pentax55 for both it is a mechanical vignet from the adapter, the 35pc distagon vigneting is coming from image circle (in fact Front ring Of the lens)...
..