Hi all i own NIkon D40 with std lences and also got Sigma (Sigma 70-300mm f/4-5.6 APO Macro DG )
I need some information regarding use of teleconverter, i want to double the focal length of lence of my 2 lences. i need some specific information such as is this converter will afect my micro capability and whether its worth to use it...
i have selected following teleconverter Kenko Teleplus MC4 2x Teleconverter
please help me
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