Lightning - Creative Uses of CHDK - CHDK Forum
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Lightning

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Offline JoJa15

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Lightning
« on: 11 / November / 2008, 11:57:32 »
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Here are a couple shots of lightning I got from a storm that passed through last night.

These were taken on a S5IS using Fireworks mode. Latest CHDK and MD script.

It is a shame that there were rain drops on the window as it messed up the shots.

Does anyone have some tips on how to reduce or handle chromatic aberration (I think that is what it is called). It is where you might see a bright red blur next to a dark/bright area in an image. Is that from the lens, the camera CCD chip, or something else?

Also what are good settings to put the camera into for taking lightning during the night or during the day? I just set it into fireworks mode as I thought that would be the closest setting that would work.

Thanks in advance for any help provided.

John
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Offline vk2him

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Re: Lightning
« Reply #1 on: 12 / November / 2008, 05:17:59 »
According to the EXIF data in your shots the exposure and aperture were F8 and 2 seconds and you used auto focus.

The first shot looks over exposed and the second is under exposed, I'm wondering if the 2nd shot was delayed more before opening the shutter?

I use manual focus and set to infinity before starting script. I also use TV priority mode 1 Second for night shots and AE for day. Hope that helps? Cheers

« Last Edit: 12 / November / 2008, 05:31:38 by vk2him »
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Offline JoJa15

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Re: Lightning
« Reply #2 on: 12 / November / 2008, 10:56:54 »
Thank you for the help! I will try out those settings next time. I just set it to Fireworks scene mode which I guess does F8, 2 seconds exposure, and auto focus.

Any thoughts on how to reduce the chromatic aberration?

Thanks,
John
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Offline ISO64

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Re: Lightning
« Reply #3 on: 13 / November / 2008, 12:35:07 »
Inexpensive cameras (mine is S3 IS) are prone to so called "purple fringing". Simply put, different wavelengths are focused at different points and the effect is easiest to see at the corners. Extreme zoom in or out does not help either, same for super-macro.

I do not have my laptop with me right now, but I know that there are image processing SW that can selectively move yellow/blue, magenta/green or red/cyan pixels in/out of the image centre to compensate for this. Will loook into this soon.

Nice photos!

Stormy skies!
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Offline dzsemx

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Re: Lightning
« Reply #4 on: 13 / November / 2008, 15:28:08 »
generally superzoom, cheap and wideangle lenses suffer from purple fringing.
Especially S3 has RED fringing...
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