Long Exposure Noise Reduction - EOS R5 Tip 19

Long exposures can have their own problems with noise. Long exposure noise reduction attempts to reduce that noise. In this tip we look a the process and options available in the EOS R5.
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00:00 Intro
00:28 Background on Noise and Long Expousre NR
04:20 Options
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[@gossedejong9248]

as usual: brilliant, helpful, very kind, thank you!!!

[@Squeezesify]

Back in business, Jason! Really a serious talk on this.
Would you advice to do this if Even only shooting RAW?
Thank You
Jan, Denmark

[@PointsInFocus]

I only shoot raw, so maybe...
See this is where things get complicated, especially with auto where the NR process doesn't always happen. I've been trying out leaving my R5 set to auto for this as it doesn't seem to have any negative impacts on anything else (shooting, setting, or image quality wise), and can potentially help remove a bit of noise in some images. That said, at the same time, the trigger conditions for auto are still a bit of a mystery to me (there's definitely an exposure time and ISO speed component) which is potentially less than ideal since I can't predict when it will trigger or not (and it may not happen consistently).
I personally wouldn't set it to "on" regardless of whether you shoot raw or not.

[@charlesmallo]

When you're shooting in RAW, there's no in camera noise reduction. Noise reduction has to be done during post processing.

[@PointsInFocus]

That's true for high ISO NR, but not long exposure NR.
You can verify this by shooting two dark frames in RAW with LENR on and off, and examining them with the exposure turned up to amplify the noise. The intensity of the nose in the two images will be different - depending on the ISO and exposure length, the LENR image may be markedly worse.

[@charlesmallo]

@@PointsInFocus that's something I need to try out. Unfortunately the manual of my R5 isn't clear about this. With my previous Canon's the manuals stated no in camera nr when shooting in raw.
But what always worked for me to reduce noise with long exposures is keeping the ISO low :-)