Nikon Corp's logo is pictured at an electronics store in Tokyo August 9, 2012. Nikon shares fell as much as 12 percent on Thursday, a day after the camera maker lowered its full-year operating profit forecast below market expectations to reflect a change in its foreign exchange rate assumption for the euro. REUTERS/Yuriko Nakao (JAPAN - Tags: BUSINESS EMPLOYMENT) REUTERS / Reuters Nikon 突然宣佈全資收購同業...