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Long Exposure Noise Reduction

Ferguson

Cape Coral, US
5696 posts

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"RE: Long Exposure Noise Reduction"

Ferguson Silver Member Fellow Ribbon awarded for the generous sharing of his high level expertise in the spirit of Nikonians Nikonian since 19th Aug 2004
Sun 14-Jul-13 12:23 PM

>Another place to be careful about LENR is with multiple
>exposure images. I often use multiple exposures in lieu of
>long exposures. For example, with moving water I might use a
>series of 5-7 two second exposures rather than one 30 second
>exposure. The time between exposures for LENR to work can
>reduce the smoothness of the multi-exposure image.

I get why LENR would cause breaks in both of these, but I am curious why multiple exposures without reading out the sensor is better than a continuous long exposure of the same (as the cumulative) length?

Stacking separate exposures improves signal to (thermal) noise ratio by reducing the noise accumulation time in each. I would have thought that by not reading out the sensor in between, multiple exposures are the equivalent of a long exposure?

Or does the camera read it out each time and do some kind of average or addition itself?

Linwood

Comments welcomed on pictures: Http://www.captivephotons.com

This is a hot, active topic! Long Exposure Noise Reduction [View all] , helmdr , Tue 25-Jun-13 03:32 PM
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