I just bought a new sony vario tessar 16-70mm lens from eBay. After reading up on this lens, I became concerned about the amount of decentering issue with this lens.
I printed a B&H Photo test sheet and decided to do a couple of test shots. Mounted my camera on tripod, disabled OSS, and shot the sheet with widest aperture on self timer.
My heart sank when I saw that the upper left corner was very soft compared to the upper right which was sharp.
Is it acceptable or shall I exchange it? I read that pretty much there are no perfect lens. But this is an expensive lens and I was expecting a bit more.
Thanks and please pardon my noobness.