近日美国、日本和国内均有网友反映，佳能EOS 7D相机在特定条件下拍摄会出现重影。所出现的重影是相机上一张拍摄图片的残留影像，在正常情况下一般不能察觉，但在进行调教亮度、反差等影像修整时就可能会看到。

DPreview上提到，重影出現的条件如下：

1. Shoot with maximum continuous shooting rate.(8.05fps)
2. Shoot with fast shutter speed.(>1/500s ?)
3. Image's back ground is flat and bright.(Blue sky,etc)
4. Target is a fast moving object.(Bird,Jet fighter,etc)
5. 2nd or later frame image has a ghost of previous frame image.