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Sigma has issued an advisory for five of its lenses over an error that occurs when they're used with select Canon DSLRs. The issue crops up when the cameras' "Lens aberration correction" function is turned on. dpreview.com »
As with most new Canon DSLR releases, there are some third party lenses that may present the odd vignette when “Lens Aberration Correction” is turned on with various Canon DSLRs. From Sigma: We have found that some SIGMA interchangeable lenses for CANON are not fully compatible with CANON EOS 6D Mark II released on August Read more... canonrumors.com »
From Sigma Thank you for purchasing and using our products. 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. canonrumors.com »