After Sigma, also Tamron issued a product advisory for some of their lenses having problems with live view mode on the Canon EOS 5Ds and EOS 5Ds R.
Tamron press release:
A notice regarding compatibility issues with the EOS 5Ds and the EOS 5DsR, and availability of firmware update service (JUNE 2015)
Dear users and potential purchasers of Tamron interchangeable lenses for Canon. Thank you for being a valued customer of Tamron products.
We have learned that the AF functions of the following interchangeable lenses for Canon do not function in Live View mode when used on the EOS 5Ds and EOS 5DsR which went on sale in June 2015. We sincerely apologize to all users and potential purchasers for any inconvenience the issue may cause.
Firmware update service is already available as this is the same case when EOS Rebel T6s and the EOS Rebel T6i were released. Also, Model A011 with the latest firmware for panning shot treatment is compatible and functions properly with these new cameras.
*Please see below for the previous firmware update service announcement regarding EOS Rebel T6s and EOS Rebel T6i and the firmware update service for SP 150-600mm F/5-6.3 Di VC USD (Model A011） for panning shot.
- SP 15-30mm F/2.8 Di VC USD (Model A012）
- SP 70-200mm F/2.8 Di VC USD (Model A009）
- SP 150-600mm F/5-6.3 Di VC USD (Model A011）
- SP 90mm F/2.8 Di MACRO 1:1 VC USD（Model F004）
- 28-300mm F/3.5-6.3 Di VC PZD (Model A010）
- 16-300mm F/3.5-6.3 Di II VC PZD MACRO (Model B016）
For those who require firmware update service, please contact our service department.