Today I put a 150mm and 200mm lens on my 5x7 camera and focused on a flat subject around 10 feet away. These are not "wide" lenses but standard designs.
I noticed that with the lens wide open especially, the edges of the subject were out of focus when the center was in focus, and vice versa. Once I focused the lens for the corners, the corners were sharp: I hadn't reached the limits of coverage.
I tried the same experiment at infinity distance and still noticed a focus shift towards the extremes, although it was less and disappeared with a bit of stopping down.
I rarely shoot wide angle lenses. Is this normal ?
We expect a bit of darkening towards the corners due to the increased distance, but focus shift too ?
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