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I tried a series of photos to show how vignetting works as the lens aperture is varied, for the Laowa fisheye. I took outdoor shots low to the ground on a tripod, as I adjusted the aperture ring through each labeled f/ stop detent. Shutter speed was automatic. I pasted a middle slice through the circular image for each aperture into a single slide, then labeled and marked that to post here. The aperture is indicated off the right end of each slice. A red line marks the horizontal center. The slices all contain the same pixel locations from the photos and were treated identically. The photos themselves were all done identically except for the manual aperture settings and the automatic shutter speeds compensating for them. You can see the ends of the slices are darkened for larger apertures but it improves as aperture is reduced. I kind of figure that at f/8 and narrower I'm unlikely to notice the vignetting in most pictures. Of course, fisheyes are easy to get enough light into, even handheld in dim conditions.