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hi all, own A7r.want use leica m lenses,what is the best adapter leica M lenses to E mount,is any difference on picture adapter 20usd or high valued 150-180usd in sharpness,vigneting etc.?
A good cheapo will be as good in those aspects as an expensive one. The lenses themselves sets the limits - if you're not unlucky with a decentered etc adapter. Defects can come both cheap and expensive - though higher risk with cheapos. For Leica many/most lenses 35mm and below will have issues with smearing, color cast etc independent of the adapter.
There is a nice Voigtländer adapter with helicoid that adds close-up/makro-like capabilities to lenses. Currently I use a midpriced "branded" adapter (~50€ "KiwiFotos") which is fully suffice and doesnt add any defects to my M-mounts.