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https://purengom.com/2009/10/08/%ec%9c%a0%ec%be%8c-%ec%83%81%ec%be%8c-%eb%aa%85%ec%be%8c%ed%95%9c-dslr-%ea%b8%b0%ec%b4%88-2-%ec%b4%88%ec%a0%90-%ec%9d%b4%ed%95%b4%ed%95%98%ea%b8%b0/
유쾌 상쾌 명쾌한 DSLR 기초 - (2) 초점 이해하기