You said that you’re using this Topaz software to reduce the noise, but you’re also stacking groups. Is there a preferred order to do this, or are they complementary? What does your image train look like? Are you doing the Barlow filter wheel camera… …or are you reversing the Barlow in front of the filter wheel? Many years ago all the cameras where 8-bit and now they’re 10 or 12-bit and 16-bit. You’re using a 12-bit? Is 10 or 16-bit any better?