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How Good Are Cheap Fisheye Adapters?
Opteka 58mm 0.3X HD Ultra Fisheye Lens Adapter OPTSC58FE B&H
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