Sorry this isn't specifically RPi-related but maybe someone knows. I have a 3rd-party camera board on a Pi which is (I presume) a OV5647 sensor with a fisheye lens. It sees around 170 degrees from edge to edge, and actually more than 180 degrees into the corners. Here is a picture of the module (sitting on a piece of wood, on top of my roof) and picture from it: https://photos.app.goo.gl/Xn9GJUpAkHGGPWDz6 The lens does have adjustable focus, but the image you see there is the best I could get from it. I'd like to find something better (less fuzzy, and better low-light performance would be good too). I know you can buy something like "STARLIGHT XPRESS OCULUS ALL-SKY CAMERA" for $1k but I'm looking for cheaper than that.
Lately I've seen what may be somewhat better quality cameras being sold as 180-360 degree view action cams, either self-contained (recording to internal SD card) or as mobile phone accessories. Are such devices available as a USB camera, so I could grab stills from it from a connected Pi?