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Well the long exposure noise reduction does work fairly effectively, you need to drill well down into the menus to find it though. People saying it does not make a noticeable difference I would have to suspect are not aware of what they are looking for.
I will have to have another go at the next opportunity now I have worked out that it is available and fairly effective (there still seems to be some random hot pixels on some frames, where normal light frames were quite noisy before) and that it had changed back to F7.1.
F3.5 at 15 seconds in a 40 second cycle (I timed a couple of cycles with NR on) should get me a lot more detail in the sky than I was getting out of 30 seconds at F7.1
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