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Night sky 60 second exposures

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Offline LjL

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Re: Night sky 60 second exposures
« Reply #20 on: 07 / July / 2008, 20:06:59 »
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Indeed, it doesn't make very much sense to take very long exposures on a CCD.
You'd usually rather take shorter exposures and stack them (which also help if there is any drift, besides).

That CHDK allows longer exposures than otherwise possible is nice, but don't forget there is a semi-valid reason why Canon stopped us from taking very long exposures in the first place! ;)

Sensor noise averages out like a charm if you stack several exposures.

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Offline fe50

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Re: Night sky 60 second exposures
« Reply #21 on: 07 / July / 2008, 20:52:35 »
Joshatdot,

have you tested the "Noise Reduction" settings in the RAW parameters menu (-> Wikia: CHDK firmware usage #RAW parameters menu) ?

With Dark-frame-subtraction enabled and ISO <= 100 you should have not so much noise...

 

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