Just bought the lens. Test it and very happy until I noticed dark upper corners, worse in the left. It only show up at small aperture (eg F11 F16 F22)and focus at infinity. The smaller the aperture the worse.
its worst in my A7II. Less noticeable in the A7RII. No hood or filter attached.
Picture shown is taken by A7II:
any idea what’s the cause? Please help. Can see the dark corner in EVF while composing and focusing
All camera have updated firmware.