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Override ISO

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Offline RaduP

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Override ISO
« on: 17 / May / 2008, 04:49:39 »
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I tried the ISO override thing on my A570, and while it seems to work OK for values in the higher range (around 800), I find it totally not working for values lower than 80.
I didn't watch the exposure time to see if it is any different than ISO 80, but I've noticed no single improvement in the noise. I tried all kind of values, from 10 to 80, and the noise is pretty much the same.
Did anyone experience lower noise at lower ISOs?
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Offline zeno

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Re: Override ISO
« Reply #1 on: 17 / May / 2008, 08:03:47 »
According to the A570 entry in the camera features chart here CameraFeatures - CHDK Wiki the lowest ISO value you can set is 50.
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A570, S100, Ixus 127
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Offline RaduP

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Re: Override ISO
« Reply #2 on: 17 / May / 2008, 13:50:04 »
Yes, I know that most camera can't go under ISO 50, but I tried values higher than 50 and the noise is pretty much the same as ISO 80.
I would have expected an ISO value of 50 to give much less noise than 80.
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