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Hi, 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 was 4 minutes, this was achieved by trying an exposure at say 1 min which resulted in black and thus increasing the time until it looked right on the scene and this History gram confirmed this. I then have to wait another 4 minutes for processing to take place removing ‘hot pixels’, 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 ? At the time I was surprised it was as long as 4’ . what’s going on to make it sooooo long ?
I'm not usually a black & white kind of guy. And when I am i prefer to use Nik Silver Efex because it gives the best control. But I was out shooting some long exposures last night thanks to the sun returning to Michigan and realized that Acros + R is extremely fitting for long exposure cloud work.