Recently, there are more and more talking about upcoming new feature “C-Log” added on Canon EOS 5D Mark IV, according to latest rumors on CR, this new C-Log feature will not be just a firmware update.
Source said that you may need to pay a visit of Canon service to get C-Log updated. There is no mention whether or not this will be a service you will have to pay for or not, or if future EOS 5D Mark IV cameras will ship with the feature.
via: CR