There is NO Light leak to the sensor nor does it affect exposure in real life.

Started Apr 7, 2012 | Discussions thread
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RichW Forum Pro • Posts: 12,769
Many camera models are affected....

when you have an extremely sensitive metering system. It's not unique to the 5D3. And it's only with the lens cap on!!

Take the lens cap off and take some pictures!

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Canon EOS 5D Mark IV Canon EF 20mm f/2.8 USM Canon EF 50mm f/1.4 USM Canon EF 50mm f/1.8 II Canon EF 17-40mm f/4.0L USM +5 more
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