When they are combined, you get relatively noise-free shadows without blowing highlights.Īccording to Magic Lantern, there are some downsides to using the Dual ISO firmware, though. The low sensitivity rows capture highlight detail, while the high ISO rows capture shadow detail. Their latest creation - called Dual ISO - dramatically increases the dynamic range of the 5D Mark III and EOS 7D by four stops, bringing the total dynamic range to 14EV. This allows you to pull detail out of the shadows with a lot less noise than with the 'stock' firmware. The technical details are complex, but simply put, it works by interlacing two rows of pixels captured at ISO 100 with two rows taken at a higher sensitivity (usually ISO 1600). The folks at Magic Lantern are no stranger to adding new features to Canon DSLRs, courtesy of their EOS Camera Tool software.
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