前两天在ebay上面买了一个二手5D，拿到手后便发现如下故障：
1、 高快门时，暴光不稳定，有时亮，有时暗。使用手动暴光，连拍，图1、图2为例；
2、 1／8000快门下，九成片子全黑，个别片子能隐约看到被摄物（f2.8拍天空，排除欠暴的可能，使用20D相同设定可得到正常图片）。图3、图4为例。
卖家看到照片后，死活不承认是相机的问题。还以一个职业摄影人的身份，指责我不应该用这么高的快门和ISO来拍照（第一次发现问题时是晚上，对着落地灯照的，ISO1600，其实用ISO100问题一样），并且说联系了佳能厂商，佳能也说这问题有可能出现，属于正常。
欺负人啊！该死的美国佬，坚决跟他斗到底！
来这里给个位诉诉苦，大家分析一下哪个部件出了问题，顺便安慰我一下。

1/2000, f2.8

相同参数，明显欠暴

1/8000, f2.8
不应该这么黑吧？？

小三角 3楼rebelxti

相同参数，明显欠暴

这长居然还能看出点儿什么。

M模式下，相机还告诉我过暴一档呢，拍出来全黑。

我现在等着ebay仲裁，无耻卖家恶人先告状，居然还说他手里的另外几台5D高快门的时候也这样，当别人是傻子啊。下面是他的原话：
11/17/2008 06:36 PST - Seller: Camera was delivered on time and functioning as described. The buyer's settings on the camera are not within its capabilities. This is not a limitation on the Canon 5D, which is a great professional camera. The buyer is attempting to shoot a low light situation with an extremely fast shutter speed. He is setting the ISO to be sensitive to light however he's counteracting that by using too fast of a shutter. I'm not an electronics store that can absorb return shipping costs, ebay listing fees and paypal fees to allow a winning bidder to test drive a certain model of camera. If the bidder did not intend to purchase (or was unsure if certain model of camera would do what he needs) he shouldn't have bid according to ebay rules. I'm just a photographer selling my used equipment. I described the item accurately and acted in good faith.
11/17/2008 06:27 PST - Seller: We have duplicated the settings on our other Canon 5Ds and received the same result. I've also spoken with Canon and their response was "it would have to be an extremely well lit room for those fast shutter speeds to work, regardless of the high ISO". The camera you purchased is functioning as a Canon 5D should. The item was as described and functioning normal.
我都不想仔细看，看多了生气。

右腿大哥，我就是看了你的帖子才上5D的啊，你看我的20D拍的多好，同样的参数，同样的1/8000

几张片子都是隔着窗户拍的，当然不能和你这个比了。

小三角 13楼右腿骨折过

引用:

作者: rebelxti M模式下，相机还告诉我过暴一档呢，拍出来全黑。

那一定是有问题了

看我5D 拍的

最大光圈

没这么肉嘛

镜头是百威

Tv, Av都试过，高快门的时候还是欠暴太多，1/8000基本全黑。
20D那张是阴天照的，同时也用5D试了，ISO800，如图。