by damned truths

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You apparently have Highlight Correction activated. This forces the higher ISO limit (usually forcing it from 100 to 200, though you also have Expanded Sensitivity enabled, which gives you a broader ISO range starting at 80, thus now 160). So, there's nothing wrong with your camera. Mind you: Options you find that look superior may come with a downside. ...


Sorry, you're way off. :-) Your digital camera only has one base ISO value. The base ISO is the single ISO setting at which your sensor/processing pipeline produces its best signal-to-noise ratio. The base ISO is typically the minimum ISO value which can be selected numerically. (ISO settings below the base ISO are usually marked PULL or LO to avoid any ...

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