We had a pictorial at a studio yesterday. I used my Nikon D7000 and my Nikon AF-S NIKKOR 50mm f/1.8G Lens. At first it was fine but then the vignette slowly appeared on the side. We used flash trigger in the studio and set my white balance at 'flash'.
I don't know what's wrong. Is it the lens or my camera? Or probably just my settings?
picture:
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