Amazon.com : Opteka 58MM 0.35x Fisheye Wide Angle Lens Compatible with Canon DSLR Cameras Including Macro Close Up Attachment : Camera Lenses : Electronics
Opteka OPTSC37FE 37mm 0.3X HD Ultra Fisheye Lens Adapter for sale online | eBay
52mm Fisheye Lens 0.35X HD Wide Angle with Macro Close Up - KENTFAITH
Fisheye Adapter Set – Lomography
Dyron 16mm Fisheye Lens and Quick Adapter for S95, S100 housings | Bluewater Photo