A shot with Zenitar 16mm fisheye, my UWA lens…
A little distortion correction with the profile for Sigma fisheye 15mm f/2.8 , no crop. It is not a sharp lens, @f/16 the results are good with increase in clarity and sharpness (here I used f/11 because of the low light and I increased the sharpness a little more with high-pass filter). With careful framing the distortion remains unnoticed or becomes a part of the composition. This makes me happy as I use the lens as an ultrawide one.
Camera: Nikon D7000
Lens: Zenitar 16mm 1:2.8 fisheye, F-mount
(shutter 1/50 | ƒ/11 | ISO:100 | tripod)