Firmware update v1.01 for Sigma 18-35mm f1.8 Art (for Canon) enables Autofocus to work at all apertures This guide leads you through the firmware update process for most Sigma lenses, in this case the Sigma 18-35 f1.8 Art lens for Canon. The latest firmware for the 18-35 features Autofocus for the Canon C100 DualPixel Autofocus for the complete aperture range …
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