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Your observation is not necessarily related to noise reduction Mike. It could simply be the transition between sharpening masks or similar. Some noise is good. If you can smooth an image so there is not perceivable loss of detail, then IMO you're hitting close to the mark. The main goal is to hit the background noise as the foreground noise is resolved with mega data. If you don't have that luxury of mega data then some subtle noise control on the foreground can work wonders. It is a fine line and ultimately the imager needs to be pleased with the level of noise reduction - no one else. As I've said before, it doesn't matter if you've got 30 hours of data, you still need noise control in your processing routine as its introduced when performing certain processing tasks.
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