Oh, I found a few more images for comparison. This first image was taken with a single shot (a normal photo), 85mm at f1.2 (a very fast lens indeed!) The 2nd image was taken from the same exact position, but I swapped the 85mm for a 300mm f2.8 and shot a grid of images. This is essentially simulating what a much larger chip/film would do to DOF, like a large format camera.
Now, I usually don't stitch with the 300mm because I like the effect better when it's a wider view (the 85mm stitched can easilly be as wide as a 24mm lens). With a long lens shot you expect the background to be blured, but on a wider view the heavy defocusing is more apparent as not being normal. But I did this as a comparison with the 300 to show someone who just would not believe that a stitched 300/2.8 would have more background blur than the super fast 85/1.2. Somewhere I've got images of a single 28mm shot next to a stitched shot from the 85/1.2, but I can't seem to find it right now.
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