D610 long-exposure noise

Started 9 months ago | Questions thread
TH - NikonStrobist
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Re: D610 long-exposure noise
In reply to Ruud Wilschut, 8 months ago

Ruud Wilschut wrote:

I'm really surprised to see this kind of noise from the D610 sensor.
Do you have enabled Long Exposure Noise Reduction (LENR)? Thist kind of NR substracts an extra dark frame right after the first picture is taken. In fact the camera makes a second equally long exposure with the shutter closed. So making a long exposure of 2 minutes takes 4 minuter including the dark frame substraction process.

Long exposure noise reduction with dark frame substraction maps the sensor noise out of the image for a substantial quantity. It is good explained here: http://en.wikipedia.org/wiki/Dark-frame_subtraction

Ruud

Fascinating.  I've been wondering what caused that doubling of time - I knew it was related to processing out the noise, but this clarifies what's actually causing it...
+1 for filling in a gap in my understanding and teaching me something.

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