Sigma has issued a service notice advising that some of its Canon mount interchangeable lenses cannot be used with Live Mode on the Canon EOS Rebel T6s (760D) and the Canon EOS Rebel T6i (750D). Lens owners will receive a free firmware update to fix the problem, though the company has not provided a timeframe for when the update is expected. Both current and discontinued lens models are affected by this issue. Read more
Articles: Digital Photography Review (dpreview.com)