Pentax SMC DA 10-17mm / F3.5-4.5 (IF) ED lens (Fish Eye Zoom) for Pentax (Electronics)
This lens is a very compact fisheye zoom. Unlike a classic wide-angle lens is not corrected by, so recorded very strong. That must be part of this objective so, "it is not a bug, it is a feature"! At 10 mm makes it almost 180 degrees in the diag