Read more comments: cheesycam.com/gh4-4k-vs-1080p-crop-view-with-fisheye-lens-de-fish-to-1080p-test/
Examples of crop factor between 1080p and 4K with the GH4 Camera. Rokinon 7.5mm Fisheye lens MFT and Panasonic 12-35mm F/2.8.
Photographers often shoot with Fisheye Lenses to get a very wide view and correct the distortion in photo editing software. It's possible since the resolution of photos are very high.
Typically if you attempt this with a 1080p video you will stretch the resolution. Now that the Panasonic GH4 can shoot 4K, there is extra resolution available if we output to a 1080p file.
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