Raspberry Pi Camera (G) with Fisheye Lens - PiShop.us
Amazon.com : Opteka 58MM 0.35x Fisheye Wide Angle Lens Compatible with Canon DSLR Cameras Including Macro Close Up Attachment : Camera Lenses : Electronics
Fisheye lens - Wikipedia
IP6F - 6MP Fisheye Security Camera: 360-degree IP Camera with Audio