Originally posted by ogl Why this camera has ISO button, ISO at the wheel and ISO could be put at front and back control wheels in different shooting modes...?[COLOR="Silver"]
Most likely because them being used differently.
ISO on the dial is most likely used for setting up ISO parameters. (Fi ISO range, which sometimes would be better to adjust "live" than manual ISO)
ISO-button is used for switching between manual/auto ISO and changing ISO in modes where ISO is not available on any e-dial.
Changing ISO with e-dials is not available in all modes.