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Cheap Fisheye - a set on Flickr
by 4004 (via)Made from the innards of a broken Sigma 28-200mm lens. Cost £5 from the camera shop in watford, Bargain :)
Cheap Ringflash
by riptikiHow to create a circular electronic flash tube that fits around a camera lens to give shadowless lighting of a subject near the lens, esp. for macrophotography.