Yup I agree that it probably is bothersome even though I like a bit of vignetting, and that it doesn't really clean up enough. I think it is possibly the adaptor, though so far it hasn't given a problem with anything else. But it might just be the hood in conjunction with the adaptor so at some stage I will try to shoot again without the hood. OTOH, the A7R is tending to give slightly better results in terms of resolution with many of these lenses, because it is possible to critical focus more easily. In general I would prefer to use the Leica M Macro Elmar F4 90mm because it behaves very nicely on the A7R and is a darned sight lighter and easier to hold!