I made some test under low light condition and found a not designed feature of the camera. If I closed the lens with the lens cap and made a full dark image, the result was not completely equalized black. The light leaks influenced the image on one longer side - in my case - darkness. Of course this depends on the camera construction and the environment lights.
However, it would be a considerable correction of the camera body the leaked light correction.
Sorry, if it is already implemented, I did not found in any documents.
The enclosed image show my case.