From Canon USA
To Users of the EF200mm f/2L IS USM and EF800mm f/5.6L IS USM Lenses with the Canon EOS 5D Mark III Digital SLR Camera.
Thank you for using Canon products.
We have confirmed that when the EF200mm f/2L IS USM and some units of the EF800mm f/5.6L IS USM lenses are used with the Canon EOS 5D Mark III Digital SLR Camera, the Lenses may emit an abnormal noise.
The Canon EOS 5D Mark III Digital SLR Camera does not need to be repaired as a result of this phenomenon.
The support measures for this phenomenon have been decided and they are as described below.5 Comments