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I'm considering buying a grey market Sony a7r II from Electronics Valley on eBay for $2,499. What's your take on buying grey market? Any problems or nightmares you've personally experienced? Anyone have experience with Electronics Valley? They seem to be pretty reputable, as eBay vendors go.

hello everyone, i need help with a very peculiar banding problem i have observed with my A7Rii. my lens is the e mount native sony zeiss 55mm f1.8. when shooting indoors, there often is a dark band clouding part of the picture taken. if i take stream of pictures in continuous mode or single shots one after the other, this is very visible. band is moving up and down sometimes clearing the whole picture, sometimes blocking it all, sometimes wider, narrower, denser... i suspected shutter frequency problems, like you would see when shooting a pc monitor but i think this is different. please take a look at my pictures, i downsized them considerably for ease of download. one single picture does not tell much but looking at them in series will tell the whole story. typically they were shot wide open and 1/250 but the results are not any different at f8 either. changing the iso does make a difference either. i tried shooting with a sony rx10 and did not experience similar problems. here are my links: https://www.dropbox.com/sh/qkq2mlh46d1p3vr/AADU5mjRcQoZZ4NTZu6--Y0Sa?dl=0 https://www.dropbox.com/sh/kc1sfitf5836n1a/AAAHT0KMOuC5fnT3CVEy0MEHa?dl=0 https://www.dropbox.com/sh/uisyja5zp74ymuf/AAAsz-k-pJMIs1F74rC8Utwna?dl=0 attached the files on the first link directly: