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R5 + Sigma 14-24mm 2.8 - Not Compatible?

Started 1 month ago | Discussions thread
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brockburwell Regular Member • Posts: 144
R5 + Sigma 14-24mm 2.8 - Not Compatible?

I recently got the R5 and the Canon adapter (the more expensive one) and I assumed it would work with my EF Sigma 14-24, but I'm getting some serious vignetting with it and I don't exactly know why - the same thing happens with my Sigma 35mm. 
What is the purpose of this adapter if it doesn't properly adapt my EF lenses? Do Canon EF lenses work with this adapter and it's Sigma that's the problem? 
I updated the firmware of the camera and the lenses and that didn't help.

Any insight would be great.

Thanks!

 brockburwell's gear list:brockburwell's gear list
Canon EOS 6D Panasonic GH5 Canon EF 100mm F2.8L Macro IS USM Canon EF 70-200mm F2.8L IS II USM Canon TS-E 24mm f/3.5L II +7 more
Canon EOS R5
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