Download and support
EFTL_VER1.8 Update: Compatible with Panasonic S1RⅡ
85mm F1.8 FFSTM-L II VER2.7 linear and nonlinear focus (Download the zip file and unzip it to use)
85mm F1.8FFSTM-L VER3.4 Firmware Update（Optimize compatibility with BF cameras）
85mm F1.4 FFSTM-L VER3.5 Firmware Update（Compatible with BF and Leica L1 cameras MF function）
50mm F1.8 FFSTM-L FW VER.3.2: Optimized Sigma BF cam compat. & sleep current.
55mm F1.8FFSTM-L FW VER.3.2: Optimized Sigma BF cam compat. & sleep current.
85mm F1.4FFSTM-E_APPv38 Firmware Update（Optimized Tuchong information and fixed some known bugs）
35mm F2.0 FFSTM-L _VER1.9Resolved lens recognition issues when installing on powered-off cameras.
33mm F1.4 CFSTM-E_APP_ver06 Firmware Update (Optimized image information and focus ring rotation)
33mm F1.4 CFSTM-Z_VER1.11 Firmware Upgrade-Optimized image information, manual focusing