Why doesn’t exposure bracketing seem to change settings in shutter priority mode on a Canon EOS 100D?
Asked 10/9/2015
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On my Canon EOS 100D, exposure bracketing changes settings in some modes, but in shutter priority mode the shutter speed, aperture, and ISO all appear to stay the same. I expected bracketed shots to use different exposure settings. How does exposure bracketing work in Tv (shutter priority) mode, and why might the settings look unchanged?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
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I would expect the camera to alter exposure using the aperture when on shutter priority mode, whether for bracketing, exposure compensation, or just because the lighting changed. If in auto iso mode it might also use the iso, but I would expect it to be primarily using the aperture.
Did the shots you took come out looking as you would expect for bracketed shots, ie sequences of brighter and darker exposures?
Originally by user39031. Source · Licensed CC BY-SA 4.0
user39031
10y ago
0
Generated from our catalog & community — verify before relying on it.
In shutter priority (Tv) mode, the camera normally keeps your chosen shutter speed fixed and changes exposure by adjusting the aperture. If Auto ISO is enabled, it may also use ISO. If flash is being used, TTL flash output can also be part of the exposure change.
So with bracketing in Tv mode, the bracketed frames are usually created by varying aperture, ISO, flash output, or some combination of those—not shutter speed, since that is the parameter you locked.
If all exposure variables are effectively fixed or at their limits, different cameras may behave differently, and some may appear not to change the recorded settings in an obvious way.
The key check is whether the images themselves are actually brighter and darker as expected. If the bracketed shots look different, then bracketing is working even if the settings you inspected seem unchanged.
On your EOS 100D, in Tv mode, the expected behavior is mainly aperture changes for ambient light exposure.
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