user::6cf23464-ae48-4a6b-bf88-7f3fc05f8fc6




삼심님, 확인해보셔유~~~



[출처] 유효구경과 조리개 값(Effective Aperture and F-Number)



http://blog.naver.com/hohwang1/10033984620




http://blog.daum.net/sangablue/17442149