https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-5D-Mark-II-viewfinder-get-darker/m-p/548321#M133120 <P>The&nbsp;<STRONG>EOS 5D Mark II&nbsp;</STRONG>is a DSLR camera with an optical viewfinder. It cannot change the brightness all it shows is the ambient lighting. If you're talking about the&nbsp;<STRONG>EOS R5 Mark II&nbsp;</STRONG>then the EVF brightness can be adjusted. So please verify the camera that you're using.</P> Sat, 10 May 2025 18:50:51 GMT deebatman316 2025-05-10T18:50:51Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-5D-Mark-II-viewfinder-get-darker/m-p/548256#M133103 <P>Hi, when i start shooting with flash some times my viewfinder get darker and noisier,&nbsp; same thing for my sensor turning of / on or taking out battery doesnt work,&nbsp; it "fix" itself after some time.&nbsp;</P> Sun, 11 May 2025 19:02:44 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-5D-Mark-II-viewfinder-get-darker/m-p/548256#M133103 MrDonutto 2025-05-11T19:02:44Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-5D-Mark-II-viewfinder-get-darker/m-p/548321#M133120 <P>The&nbsp;<STRONG>EOS 5D Mark II&nbsp;</STRONG>is a DSLR camera with an optical viewfinder. It cannot change the brightness all it shows is the ambient lighting. If you're talking about the&nbsp;<STRONG>EOS R5 Mark II&nbsp;</STRONG>then the EVF brightness can be adjusted. So please verify the camera that you're using.</P> Sat, 10 May 2025 18:50:51 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-5D-Mark-II-viewfinder-get-darker/m-p/548321#M133120 deebatman316 2025-05-10T18:50:51Z