Got a new 75-300 f-4.0-5.6 tamron for my Nex-3 only have the cheap adaptor no af. can't seem to get good focus on anything. seems that you lose 3f-stops with the adaptor so I have been told. Next I will try going Macro to see if I can achieve crisp focus. bought a used tamron 70-210 f-1.4 3.5...
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