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We have found that Live View Mode cannot be used on the EOS8000D (RebelT6s /760D) and EOS KissX8i (RebelT6i /750D) released on April 17th 2015 by Canon Inc. with some of SIGMA’s Canon mount interchangeable lenses. For those who own the lenses, we are going toprovide a firmware update free of charge.
When the Live View Mode button on the camera body is pressed, the operation stops without displaying images on the rear LCD monitor.
[Products and Serial Numbers that require the firmware update]
17-50mm F2.8 EX DC OS HSM No. 12651501 or later
18-250mm F3.5-6.3 DC MACRO OS HSM No. 13044001 or later
APO 70-200mm F2.8 EX DG OS HSM No. 12713001 or later
APO 50-500mm F4.5-6.3 DG OS HSM No. 12902001 or later
120-300mm F2.8 DG OS HSM | Sports No. 50064494~ 50347793
APO 150-500mm F5-6.3 DG OS HSM No. 12669751 or later
17-70mm F2.8-4 DC MACRO OS HSM No. 12665001 or later
18-200mm F3.5-6.3ⅡDC OS HSM No. 12851001 or later
18-250mm F3.5-6.3 DC OS HSM No. 12656101 or later
APO 50-150mmF2.8 EX DC OS HSM No. 12839001 or later
APO 120-300mm F2.8 EX DG OS HSM No. 12676440 or later
APO 120-400mm F4.5-5.6 DG OS HSM No. 12971601 or later
[via Sigma Rumors