In-camera processing of long-exposure RAW data

Started Jan 21, 2010 | Discussions thread
ejmartin Veteran Member • Posts: 6,274
Re: Algorithm successfully simulated

Yamo wrote:

cluna wrote:

As for the astro use, best thing to do is shoot video with a D90/d300s/d3s and use astrostack. On static frames, the raw ability on the D300s is great for stacking to reduce noise considerably...I mean absolutely briliant results. Id love to see that on the D3s.

I'm sure stacking is useful for reducing noise. I'm not sure how useful it would be in replacing signal that has been flattened by a previously applied blunt instrument, no matter how many images you stack.

Stacking increases noise because each sensor read carries a read noise penalty; four reads of 1/8 sec has twice the read noise of one read at 1/2 sec. The way one gains from stacking is when one stacks a number of high ISO images rather than taking one long exposure at low ISO, and the decrease in read noises in electrons as a function of ISO is enough to compensate the multiple exposure penalty.

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