I recently splashed out on a Samyang 7.5mm f/3.5 Fisheye lens, I say splashed out but really compared with a fisheye for a full frame sensor camera it was an absolute bargain. It’s a manual focus lens and you have to set the aperture on the lens rather than with the camera so in addition to the fact that it is a fisheye, which in itself is new territory for me, it is all a bit of a learning curve.
Fishing in Tavira
A Good Place to Stand 