Firmware Version 2.1.9.1.00 incorporates the following enhancements:

1. When CN-E70-200mm T4.4 L IS KAS S is attached the following features are enabled:

• • Autofocus using the Dual Pixel CMOS AF function
  • The joystick on the camera's grip unit can be set to operate the zoom.
  • Manual control of the iris with Camera's Control dial.
  • Control of focus, zoom and iris using the separately-sold Remote Controller RC-V100.
  • Automatic aperture and push auto iris functions.
  • Start/stop recording on the separately-sold lens grip ZSG-C10.
  • Retrieval of Lens metadata, such as the model name and the focal distance will display on the camera.

2. When the camera is turned off the IS mechanical lock will be active regardless of the position of the switch.
3. Adds peripheral illumination correction for the following lenses:
   COMPACT-SERVO Lens

• • CN-E70-200mm T4.4 L IS KAS S

EF Lens

• • EF 70-300mm f/4-5.6 IS II USM
  • EF 16-35mm f/2.8L III USM
  • EF-S 18-55mm f/4-5.6 IS STM
  • EF-S 35mm f/2.8 Macro IS STM
  • EF 85mm f/1.4L IS USM

Firmware Version 2.1.9.1.00 is only for EOS C300 cameras which have Firmware Version 2.1.2.1.00 - 2.1.8.1.00 with the Dual Pixel CMOS AF Feature Upgrade applied. If your camera’s firmware is already version 2.1.9.1.00, it is not necessary to update the firmware. Once the camera is updated to the latest firmware version, it cannot be restored to a previous version.

If the EOS C300 camera does not have Dual Pixel CMOS AF Feature Upgrade applied, please download Firmware Version 1.1.8.1.00.