3/4 是什么? 变光圈镜头? F3-4? 焦距是多少呀?

来源: scim 于 2011-07-29 08:11:03 [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.