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Lovely shots, Helena! You're seriously tempting me with the 14!
lithos, the adapter is one of those cheap ones. The only trick is mounting it once the adapter is on the camera. In fact, the metabones is useless with the 21 (at least, on the NEX is) because you can't mount it afterwards, so you need to cut the fins of the lens (which I don't want to do).
The extreme corners are slightly smeared, but the rest of the frame is VERY sharp. There is quite a significant vigneting, which can be taken care of in Lightroom. I'd say there isn't much colour shift to speak about (I have corrected none on the shots above), while on the NEX is clearly visible.
Cheers to both,