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cydwhitI've got the Opteka 6.5 mm fish and I have had good results, most of the pictures in my profile came from it.
omnidataIt's the same as the other Rokinon/Bower/Vivitar/Phoenix/etc. all these lenses are manufactured by a Korean company called Samyang.
Why the Opteka says 6,5mm instead of 8mm beats me, to my knowledge and understanding they are all the same lens.