Getting overexposure out of long exposure pictures - General Discussion and Assistance - CHDK Forum
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Getting overexposure out of long exposure pictures

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Offline malabeh

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Getting overexposure out of long exposure pictures
« on: 17 / January / 2016, 15:14:50 »
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I have a A470 and with the ISO down to 10, exposure time to 10 seconds, and ND filter on, my pictures still come out overexposed. Any help would be much appreciated.
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Offline reyalp

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Re: Getting overexposure out of long exposure pictures
« Reply #1 on: 17 / January / 2016, 15:19:36 »
Quote from: malabeh on 17 / January / 2016, 15:14:50
I have a A470 and with the ISO down to 10, exposure time to 10 seconds, and ND filter on, my pictures still come out overexposed. Any help would be much appreciated.
In general, CHDK ISO overrides do not work much beyond the stock canon range. So even if you enter 10 in the UI, you are probably getting around 80.

To get longer exposures in bright light, you would need to add an additional external ND filter.
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Offline malabeh

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Re: Getting overexposure out of long exposure pictures
« Reply #2 on: 17 / January / 2016, 15:21:08 »
So I'm limited to taking long exposures in the dark then? (Which are remarkable by the way)
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Offline reyalp

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Re: Getting overexposure out of long exposure pictures
« Reply #3 on: 17 / January / 2016, 15:34:57 »
Quote from: malabeh on 17 / January / 2016, 15:21:08
So I'm limited to taking long exposures in the dark then? (Which are remarkable by the way)
Yes, unless you come up with some other way of physically reducing the amount of light reaching the camera.
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