Why does my 5DsR sometimes underexpose?

Started 11 months ago | Questions thread
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Waldo Nell Senior Member • Posts: 1,011
Why does my 5DsR sometimes underexpose?

My 5DsR is usually quite good with exposure, but sometimes it gets it horribly wrong. For instance, I shot a hundred or so photos recently with the 100 - 400 F4.5 - 5.6 II lens and exposure was good. I then switched to my Sigma 180mm F2.8 APO EX DG macro lens (a lens which never gave me any issues on this body before). Some photos were properly exposed. Some not.

Take this photo - why would the camera do this?  I had about 40 out of 70 photos totally underexposed.

RAW with no adjustments made in LR, exported as JPG

Below is the EXIF:

EXIF for above photo

And histogram (to rule out any monitor issues, though I have a calibrated NEC PA322UHD so that is not an issue):


I sometimes have the same issue when I hook up my MP-E65 macro lens and the MR14 LED ring flash - it would sometimes underexpose by 2-3 stops. Sometimes taking the battery out temporarily fixes the issue.

Latest firmware installed...

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Waldo Nell

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Canon EOS 5DS R
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