We recently acquired a circular fisheye lens. We still have our full-frame fisheye, which was used to make a previous picture of a vine maple. This is a different tree, photographed in early summer so the canopy is more complete. You can see how the branches have grown to capture more light.
Photography notes:
This photograph is deliberately over-exposed, originally exposure bracketing was used with the intent of combining the multiple images into an HDR picture. However this is the brightest image, we prefer how it has turned out.
This fisheye's image spans 180º so the edge of this picture is at ground level and and the center is straight up. (It might be slightly tilted) With our other fisheye, only the opposite corners are 180º apart. Usually the edge of a picture is the edge of the imaging sensor but here the circular edge is the limit of the image projected by the lens.
In our set of backgrounds, the first one one has the whole of the image. The others are crops from the original image. The backgrounds are very compresed to keep their file sizes manageable. Both of our fisheye lenses deliver a lot of detail in their images.