Exiftool 12.33 and newer can decode the shutter mode (MS/EFCS/ES) for Canon


CR Pro
Feb 25, 2015
The Netherlands
This makes it easier to check which mode was used after shooting:
$ exiftool -ShutterMode 20211014\ 1546\ Canon\ EOS\ R5\ -\ RF16mm\ F2.8\ STM\ -\ IMG_9078.CR3
Shutter Mode                    : Electronic First Curtain

$ for i in *CR3 ; do echo -n "${i}: " ;  exiftool -ShutterMode "$i" | awk -F': ' '{print $2}' ; done
20211013 1716 Canon EOS M6 Mark II - Canon EF-M 32mm f1.4 STM - IMG_5718.CR3: Mechanical
20211014 1525 Canon EOS R5 - RF16mm F2.8 STM - IMG_9048.CR3: Electronic
20211014 1526 Canon EOS R5 - RF16mm F2.8 STM - IMG_9055.CR3: Electronic First Curtain

In the example above you can see when I realized the LED lighting was giving horrible banding and switched to EFCS :)
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CR Pro
Jan 25, 2017
EXIF is cool in how much data it provides... but also creepy that way ;-) wish people wouldn't abuse information. Thanks for info though

that aside, love electronic shutter (though managing that much data is nuts and requires a re-think) but yeah has some limitations with things like light frequencies/flash. fast panning etc. Interesting to see Nikon doesn't have a shutter, must mean a really fast read out.
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