Dual-ISO Mode in Canon DSLRs

Bitbucket's Magic Lantern project comes up with an interesting firmware hack on Canon DSLRs. Apparently, Canon hardware allows changing the readout or ADC gain at a fast pace, every two rows. So, every two rows one can flip the effective ISO, for example, between 100 and 1600 to get an extended dynamic range at the expense of reduced vertical resolution:

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