admin wrote: ↑Thu Nov 05, 2020 11:09 pm
For what it is worth, the 13h image appears less noisy. What zoom factor did you use here (for the image)?
Don't remember really, but now I've done the same comparison adding a version of the 13h integration using just 1 scaled master dark (as per APP's definition) created from around 130x300sec dark frames. I really don't see much difference with the previous one, but if it works just as good as the usual dark frames, it'll be good to avoid wasting night time to take them instead of imaging the sky.
For this comparison the zoom factor is 100%
So, to try arriving to some conclusion: I think the maximum dither distance (10 px) value that the ASIAIR Pro allows is not enough to overcome the pattern noise of my Nikon D500, and it seems that I would mitigate this by adding LOTS of additional integration time. For accomplish this easier, I could use the scaled master dark feature from APP, maybe taking some more dark frames during the day time and devoting the entire night time to image.
If you have any other suggestions, they'll be welcome! All in all, it's really interesting that StarTools allows me to detect problems on the imaging and/or stacking phases, giving me the opportunity to correct the problems at the root source instead of blindly trying to counter them in post processing.