请教高手一个问题，多谢 

找到答案了 85mm f1.2L 的镜头 有个别情况用在40D，30D等同类机型上会出现过暴现象，网上有人有过同样经历。

[quote]引用楼主lease5252于2011-04-30 18:58发表的 请教高手一个问题，多谢 : 请教高手一个问题，今天从朋友哪里借来了一个85mm f1.2L 的镜头， 按在我的40D上，可是试拍了很多张，效果都很不好，画面不够清晰，请问是什么原因呢？ 是我的40D和85MM不匹配吗？ 多谢了！ [url=/club/job.php?action=topost&tid=289850&pid=tpc][img]p_w_picpath/back.gif[/img][/url] [/quote] probably has nothing to do with 40D and 85mm not matching. can you post a sample picture? lol. you opened it up to 1.2 and shallow depth of field = "画面不够清晰" XD ? or "画面不够清晰"?  ... shutter too slow? hands shaking? 40d has crop factor of 1.3.   your friend's 85mm on it  is 110mm. if you hand held anything slower than 1/125s, there is a good chance it is blurry.