This may or not be of interest to others here, but this was something I was curious enough about to do and I thought I'd share my images. I've been using the Oly 8/1.8 Pro fisheye lens as my wide option for a while now but due to the super-wide view and vulnerable front element it doesn't see as much use as I'd like for such a pricey option. Then Panasonic released their 8-18/2.8-4 which was intriguing for its zoom range and ability to take normal filters (filters at all...) and I became very curious about the difference in fov these two would offer. Immediately I like that with a protective filter the PL8-18 essentially becomes and internally zooming lens that covers from my favorite 14-17'ish fov and goes much wider. I took two test shots in my garage to see the difference. First, the PL8-18 @8mm: Now the O8/1.8 (defished, and cropped to 4:3): And the O8/1.8 (defished and unconstrained crop): Now this isn't about IQ, simply my camera on a tripod, focused in the centre (blue box at back), and processed in DXO optics. As can be seen the fisheye provides a far wider view (obviously), but mostly in the horizontal, and it can be seen that the PL smears the corners less (again not surprised).