I used to use 15mm fisheye lenses on film cameras for interesting images back in the film days before digital. I usually used them for an interesting & different look here & there in multi-projector slide shows I used to produce for our Corporate clients. When Microsoft Powerpoint presentations came out, multi-projector Corporate slide shows died a quick death. With digital imaging starting to be more affordable in the early days, Fisheye lenses were not as popular in my Commercial work. When we needed one we would just borrow one from where we bought our supplies & equipment. But being retired now it is an interesting way to get very wide views and then in post processing to De-Fish them. I was looking for a used Canon 15mm Fisheye lens for landscapes, but they seemed to be going for extremely high prices. Canon discontinued the 15mm Fisheye lens (FOV 180°) replacing it with the 8-15mm Fisheye zoom. I did not want a zoom fisheye but noticed that 7 Artisans had a 7.5mm Fisheye lens for m43 cameras with a FOV of 180°. Looking online at where I usually buy my equipment lately I noticed a version 2 was about to come out in 2 -3 weeks with a 190° Field of View and with better optics. So I was going to order one, but my wife looked on Amazon and it was available now. So I had it in a couple of days. The featured image is 6 m43 images shot @ 7.5mm with an Olympus OM-D 1 with the 4:3 format. This was assembled in Photoshop using the images as they were taken. I also overlapped the images more than usual because of the smaller camera sensor as I was taking the images. After blending the images I used the Edit “Warp” feature in Photoshop to remove most of the fisheye effect. Depending on the image you can also get good results using Photoshop’s Adaptive Wide Angle feature under the “Filter setting”. Then use the “Edit” Transform -“Warp” feature to adjust the corners to where it diminishes most of the “Curving” in the corners. It also helps when using a Fisheye lens to have the main horizon line somewhat centered in the image to avoid the “bowing arc” of the horizon, Makes it easier to just have to deal then with the “Corners”.