A720: Wrong auto ISO multiplier factor

[mtutak@…]

In PS A720 auto ISO values are set in 1/16 values not in 1/10 like menu says. So for ISO50 you should set 3 (not default 5), and for ISO 640 set 40 not 64 (and so on).

Good solution is to display/configure auto ISO values in pure ISO without multiplier (10 or 16).

[Allbest]

What type of ISO value do you bear in mind? There is some difference between so- called 'real' ISO and so-called 'market' ISO. When you set ISO via CHDK you are operating with 'real' ISO

[mtutak@…]

Every "real" ISO value is 1.6 times lower than displayed? The difference is 1.6 on every ISO speed...

When I set low auto ISO speed to default 5 (ISO 50), the camera sets lowest ISO 80, when I change 5 to 3, lowest ISO return to 50 value...

[Allbest]

The Factor of correlation between 'real' and 'market' ISO depends on camera model. Usually it is a fixed shift. Additionaly you need to know that not all range of accessible ISO values can be set on particular camera. I think that minimal possible ISO for a720 is 50 in 'real' scale (80 in 'market' scale)

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