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Please find the following notes on the usage of SIGMA interchangeable lenses for EOS, when attached to Canon EOS 5D Mark IV that is released on September 8th.
  • MO (Manual Override) function is unavailable with this camera (Full-time Manual function can be offered).
  • When using a SIGMA interchangeable lens for EOS, setting the corrections to [Disable] is recommended, as “Lens Correction” functions of the camera, such as Peripheral illumination correction, Chromatic aberration correction, Diffraction correction and Distortion correction are not supported.* 

* If those functions are activated, the performance of lenses may not be accurate. 
* This is not only for EOS 5D Mark IV, but also for other camera bodies with the same function.

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