Reading this excellent answer about field of view, focal length and sensor size a new question came to mind. From the drawn diagrams it is clearly visible that for the same focal length an increase ...
When a zoom lens is designed for a cropped (APS-C) imaging circle, does the imaging circle necessarily stay that small throughout the zoom range? It is easily understandable that a prime lens ...
I have a Nikon D800 and am using a Nikon 12-24mm lens with it. When completely zoomed out it produces a vignette that I don't particularly care for. I've never seen this with my other Nikon DSLRs ...