How compatible are Sigma Lenses with Canon's in-camera lens correction?
A: This function must be switched off when using Sigma lenses on Canon cameras - otherwise digital circles and shading will appear in both live view and the final image.
Please see the below advisory from Sigma - which while specific for the Canon EOS 5D mkIV - is relevant for all Canon DSLR's with lens corrections (Vignetting and chromatic aberration). The advisory for the manual adjustment of AF is specific to the 5D mk IV.
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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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