5D Mark III viewfinder darker when battery removed

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pelikansalat
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5D Mark III viewfinder darker when battery removed
3 months ago

Hey guys, is it normal that the viewfinder of the Canon EOS 5D Mark III is darker when the battery is removed from the camera? I have the Canon 17-40mm f/4 lens attached and have it wide open. Then I switch off the camera and take a look through the viewfinder, everything appears normal. As soon as I take out the battery, the image through the viewfinder gets much darker and looks as if the lens is stopped down. If I insert the battery, the image is brigher again. This all happens with the camera switched off.

 pelikansalat's gear list:pelikansalat's gear list
Canon EOS 5D Mark III Canon EF 50mm f/1.8 II Canon EF 85mm f/1.8 USM Canon EF 17-40mm f/4.0L USM Canon EF 70-200mm f/2.8L IS II USM +1 more
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Canon EOS 5D Mark III
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