Alternative for casual shooting

A real fisheye lens I did not want to buy myself, because it is too expensive to me and I admittedly do not really need. Although this screw-on lens is not a full replacement, as it itself swallows some light, but still better than a purely software-based solution. The autofocus will work!
So for amateur photographers who want to play around with the possibilities of a Fisheye times, without spending too much money, just right!