The Canon 5D Mark III launched just last month, but an issue has already been reported that’s critical enough to warrant the suspension of further shipments of the shooter, at least in the UK.
Several users noted that the camera’s top LCD was causing exposure problems. The exposure value on the Mark III was observed to change when the top LCD plate light activated while shooting in low light conditions.
Canon UK has acknowledged the fault and has apologized for it, saying:
Canon has identified that when the LCD top light is switched on in very dark situations, the displayed exposure value may change on the EOS 5D Mark III.
Canon USA has also admitted to the fault, although they haven’t decided on what countermeasures to take:
Canon is now examining the countermeasures and once the countermeasures are decided, we will post the information on our Web site.
Canon USA requests camera owners to register their EOS 5D Mark III to receive service updates that address the light leak issue.