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For example I’m trying long exposure Photography using a 10 stop filter. 
I have 2 issues- firstly with noise reduction selected ‘ON’ and during an overcast day shooting a fast flowing river in Wales and using ‘B’ mode with cable release the actual exposure is 4 minutes and then another 4 minutes for processing which I get.
But here’s the thing once noise reduction is turned ‘OFF’ the initial exposure drops dramatically to 45” ! 
I understand the processing isn’t being applied after but why has the initial exposure of 4 mins with it on, dropped to 45” whilst off ? 

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