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Mustafa Digital Arts 2:53am, 2 October 2011
I like to know if 5D MKll has build in long exposure noise reduction feature. I took some LE 5 minutes shots and I am not happy with all the noise.
Today I was talking to some friends who shoot with Nikon D300s and they showed me this feature on their camera.

- Thanks
J. David Buerk Posted 12 years ago. Edited by J. David Buerk (member) 12 years ago
Yes, but this feature only works on JPEG images, just like any other camera. If you shoot RAW you will have much more control of the noise reduction applied. Check out Custom Function 2.1 and 2.2.
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Kinematic Digit 12 years ago
I can't remember for certain, but I believe Long Exposure Noise reduction actually affects RAW files. One of the two options does not and only affects JPG files. LENR uses two exposures. The extra frame is a dark frame reduction which shoots an exposure for the same length of time as the original exposure with the shutter closed, then does a comparison of the noise and removes it. It's not the same as regular noise reduction which is based on an averaging algorithm.

Just verified it from Chuck Westfall of Canon in this article:
digitaljournalist.org/issue0912/tech-tips.html

Q: The data from turning on High ISO noise reduction isn't used by third party software like Lightroom, but what about Long Exposure NR? Does the long exposure noise reduction change the actual pixel data in the RAW file or is it separate data that isn't used by Lightroom?

A: Long exposure noise reduction applies to RAW data as well as in-camera JPEGs. Adobe software such as Lightroom and ACR (Adobe Camera RAW) will "see" it because it's already in the image data before RAW conversion.
Gareth Harper 12 years ago
From the menu go to the camera tag (next to the one with the star) Select C.Fn2:Image, press enter and select long exp. noise reduction option 2. On.

As KD says, it takes a second shot with the shutter closed, does a comparison and subtracts the noise. It is a pain but it works. A ten minute exposure takes another ten minutes to process.
Mustafa Digital Arts 12 years ago
Thanks so much for your response. This is exactly I want to hear. I will try this feature whenever I shoot LE next time.
Hbie 12 years ago
Yes but if you take 5 min exposure you will have to wait another 5 mins for NR exposure.