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Century 0.3X HD Ultra Fisheye Adapter, 43mm : Camera Power Adapters : Electronics - Amazon.com
Amazon.com : Opteka 58MM 0.35x Fisheye Wide Angle Lens Compatible with Canon DSLR Cameras Including Macro Close Up Attachment : Camera Lenses : Electronics
Opteka 52mm 0.3x HD Ultra Fisheye Lens Adapter OPTSC52FE B&H
Fisheye Adapter Set – Lomography
Opteka 43mm 0.3x HD Ultra Fisheye Lens Adapter OPTSC43FE B&H