I have been doing a day of free-lensing shooting with a Canon 5D mkIII, and on both my photos and videos, there is a perfectly vertical line splitting the picture into two parts, with a small exposure difference between the two parts.

It is subtle on photos but quite visible in video, with the movement and this line still remaining.

Has anyone have ever faced the same problem? How can I correct it?

FYI: I have been using Canon EF 70-200mm f2.8 L IS and Canon 50mm f1.4 USM both with ND filters.

Screenshot 1

Screenshot 2

  • Hmm, I've got nothing other than the observation there are actually multiple bands of different sizes.
    – AJ Henderson
    Apr 29 '14 at 15:48
  • The other bands are flares created by the free lensing, only the vertical band bother me.
    – Garronde
    Apr 29 '14 at 15:50
  • I'm talking about other vertical bands. There are actually three vertical bands on the first image of various widths and atleast one larger one if not two on the second.
    – AJ Henderson
    Apr 29 '14 at 16:13
  • I'm currently uploading an example on vimeo, this way it will be easier to visualize the problem.
    – Garronde
    Apr 29 '14 at 16:18
  • I setup a chat room for talking about this in more detail.
    – AJ Henderson
    Apr 29 '14 at 16:37

It is hard to tell from the photos what is occurring but if it is happening with two different lenses then it clearly is the camera. If it is is in exactly the same place and same size and geometry with both lenses then it is internal to the camera circuitry. If it is exactly the same then it is your image sensor. It might be as simple as cleaning it but take a look at it with the mirror up and see if you can see any smears or defects in the sensor or its surface.

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