Quote:
Originally Posted by Camelopardalis
So here's a demonstration of the noise behaviour when stacking frames from my 1100D...
Top Left = 2m frame at 6-8C
Top Right = 2m frame at 16-18C
Bottom Left = 15x 2m frames at 6-8C, stacked
Bottom Right = 50x 2m frames at 16-18C, stacked
No other adjustments applied to any of the images (other than flipping!) and cropping at 100%, I haven't even colour balanced the stacked images. The noise is actually worse in the raw images in front of me but the jpeg compression seems to smooth some of it out!
You can see that the 15 frame stack does a nice job of stomping on the noise compared with the raw frames. The 50 frame stack does an even nicer job of smoothing out the noise, but note how much noisier the "warmer" frames were to start with...many more brighter pixels lurking there. I even think the 50 frame stack has more detail in it, but I haven't yet processed it fully.
The blue halos are from my scope, it's a little doublet  |
Great demonstration Dunk!
Cheers,
Justin.