Does anyone sees a different in the 2 product below? Both are selling at different price.
http://www.bhphotovideo.com/c/product/515362-REG/Sigma_179_101_EF_530_DG_ST_Flash.html
http://www.bhphotovideo.com/c/product/515353-REG/Sigma_169_101_EF_530_DG_Super_Flash.html