Lock Auto ISO in M Mode
Canon 60D: was shooting a spot-lit stage show recently; I wanted to fix the aperture at wide open and the shutter at 1/250 (getting camera shake any slower and no need for any faster). The spotlighting varied very quickly so rather than try to keep up with a fixed ISO, I used ISO Auto. When the lights went up I got the exposure I wanted with low ISO and the ISO increased as the lights went down. All good so far.
Then I wanted to lock the metered ISO after spot-metering on a face, then recomposing. As AE lock is disabled in M mode, the ISO was shooting up unnecessarily when I moved away from the face. My solution was to use Tv instead but then aperture would drift a couple of thirds away from wide open which is not what I wanted. Anyone experienced this and can provide a good reason why AE lock doesn't simply lock Auto ISO in M mode like it does in Av and Tv?
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