« on: October 05, 2014, 08:30:10 AM »
High ISO NR is not applied to RAW files, nor is ALO. Long exposure NR is applied to RAW, with that setting the camera takes a dark frame after the exposure (a 40 s exposure means a 40 s dark frame), then subtracts the dark frame before writing the RAW file. That effectively removes hot pixels, but it can actually add random noise.Thanks Neuro,
I'd turn IS off to save battery power during long exposure shooting.
I remember having Long Exposure NR switched on at one time in the past, and wondering why the Camera took progressively longer to save Images, in step with the exposure time...... A bit of reading told me it was exactly what you said that was being done.