Review Round Up - Reviews of Vivitar Products http://www.reviewroundup.com/manufacturer-rss/Vivitar Reviews of Vivitar Products Vivitar_Macro_Focusing_Teleconverter_2x Macro Focusing Teleconverter http://www.reviewroundup.com/review/Vivitar_Macro_Focusing_Teleconverter_2x Manufacturer: Vivitar Version: 2x