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I've bought my first fish-eye ever to use it for a specific project I've in mind. For now I'm just toying around with it to get a sense of the lens. For the same reason I've gone cheap and dirty, and bought a Russian Zenitar 16/2.8 instead of more expensive option. My reasoning has been that should I have not liked the results of the project, and subsequently aborted it, doing so I would have limited my expenses. It turned out that the Zenitar, or at least my copy, is a pretty good lens anyway, especially like many old optical schemes once you stop it down two or three notches. Don't fall into the old film habit: "a fish-eye has a depth of field so great that you don't have to focus" is BS. On sensors packed of pixels like basically any modern one the difference between small rotations of the focusing dial will show, you can be sure of that. A bit of CA remains at the extreme borders, but it is fairly easy to remove in Lightroom or PS. And the lens de-fishes beautifully (with a bit of a kind of "explosion effect" that is awesome to attract attention to your central subject) using the Lightroom profile for the Nikon 10.5 APS-c fish-eye or the Nikon 16 full frame fish-eye (the effect will vary slightly between the two profiles). Note: none of the following pictures have been de-fished. I've shown this last picture in color because it is easier to judge the overall quality of the image, but this is how I envisioned it (or pre-visualized, for Ansel-talk aficionados ):