![gopro fisheye lens gopro fisheye lens](http://img.dxcdn.com/productimages/sku_273159_2.jpg)
We can even tell from the different curvatures of the horizon in different images, that the lens distortion is a barrel distortion.Lensbaby has launched a Kickstarter campaign for the Lensbaby Circular 180+, a lens that attaches to a GoPro Hero's waterproof housing. We can tell this from the images, because the shape of the earth changes considerably depending on the location in the frame. The GoPro HERO4 camera used a fisheye lens. The following screenshots are taken from the video GoPro Awards: On a Rocket Launch to Space. So if we have an image taken with a fisheye lens and the earth horizon is crossing the center of the frame, the image shows the real curvature of the earth. All lines that cross the center of the frame mostly retain their curvature.
![gopro fisheye lens gopro fisheye lens](https://i.pinimg.com/736x/fe/cd/53/fecd53b1a25674fc7d7e665f72c1cb8c.jpg)
Note that the straight brown band that crosses the center of the frame remains straight.
![gopro fisheye lens gopro fisheye lens](http://www.entapano.com/jp/l/js/images/entapano_video_v280_940.png)
This is definitively false as is demonstrated on this page. They claim that fisheye lenses can not straighten or invert curvature, but only exaggerate an already existing curvature. So if the earth horizon is curved convex, like the beck rest in the left image, it will appear flat or even concave (inverted curvature) if the horizon is far enough away from the center of the frame.įlat earther deny that the flat horizon in some images is caused by a fisheye lens. But can a convex curve be inverted to a concave curve by the barrel distortion of a fisheye lens? Yes it can, as the following images show:Ī Fisheye Lens (Barrel Distortion) Inverts the Curvature All straight lines appear curved outwards, except if they cross the center of the frame. If the earth is a sphere and the horizon crosses the center of the frame, the horizon will appear curved and the curvature near the center of the frame is the same as from a non-distorting lens.Ī fisheye lens creates barrel distortion, which bends all objects away from the center. If the earth is flat and the horizon crosses the center of the frame, the horizon will appear flat. We can still get approximately the real shape of the horizon from those images, where the horizon crosses the center of the frame.