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colourful dots on picture during long exposure D800, pl...

ckhuu

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"RE: colourful dots on picture during long exposure D800, please help?"

ckhuu Registered since 25th Jul 2012
Thu 15-Nov-12 04:15 PM

>These are not hot pixels (mostly), rather it is a long
>exposure noise - which is a type of thermal noise, not stuck
>pixels. Colored spots are to be expected because in order to
>get white dots all three colors (RGB) would have to be noisy
>in equal amounts. Thermal noise affects pixel wells
>individually - that is, red green and blue pixels are affected
>separately.
>
>The "long exposure" noise reduction feature can be
>used to mitigate this to a large extent. However, when you
>use long exposure NR images take twice as long to capture
>because there is the actual exposure and then an additional
>exposure taken with the shutter closed.

I see, does that mean everybody's D800/D800E have these noise?
I did turn on the Long exposure NR and the end results are the same.

I used both camera raw and LR 4 to import the pics but i guess it will not map them out or render them automatically.

This is a hot, active topic! colourful dots on picture during long exposure D800, pl... [View all] , ckhuu , Wed 14-Nov-12 12:25 PM
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