I am an entry level photographer, I wanna go to buy Tamron AF 70-300mm f/4.0-5.6 Di LD for my Nikon D3100. This is cheaper in cost. I need more zoom with that lens so I need 2x or 4x converter. Please about that staff.
См. статью: Is there any 2x converters for Tamron AF 70-300mm f/4.0-5.6 Di LD?