This is a couple of hours of data on NGC 2903, unguided 10 sec subs. How can I get rid of the diagonal streaking pattern? I ran EZ Denoise in PI, but they are still there.
Thanks
NGC 2903
Thanks
NGC 2903
How can I get rid of these streaks?
They look like fixed noise pattern which depends on how accurate your calibration process has been, with 10s integrations (!). At FFL, I suspect, with very low signal amplitude you got a real fight in your hands.
You need to dither your data. Or if you are already dithering you either need to increase your dither size or frequency. With enough properly dithered and calibrated data added that pattern noise will be subtracted out.
Helpful Concise
It's hard to process against walking noise. Best way is, as said before, to dither.
Otherwise the systematic sensor inefficiencies will always show this pattern.
Best
Mike
Otherwise the systematic sensor inefficiencies will always show this pattern.
Best
Mike
Exactly, dithering is your answer.
Stuart,
Are you calibrating the subs? Dark and flats both? If not, that and dithering is needed.
Kevin
Are you calibrating the subs? Dark and flats both? If not, that and dithering is needed.
Kevin
Concise
For what it's worth, I use an ASI2600MC Pro, and have never had to use Flats or Darks with that camera. I always dither (only every 3rd) and have never seen anything like this.
Good luck,
Neil
Good luck,
Neil
Well Written
Thanks everyone. I don't use guiding, so can't dither (I stick to short subs). But I am working on learning how to do guiding. I have a guidescope fitted to my Esprit now, but am struggling a bit with PHD2 (the least appropriately named software ever written).
I use flats, certainly. And flat darks. But I don't use darks or biases (they're not necessary with the 2600MC Pro).
Kevin Morefield:
Stuart,
Are you calibrating the subs? Dark and flats both? If not, that and dithering is needed.
Kevin
I use flats, certainly. And flat darks. But I don't use darks or biases (they're not necessary with the 2600MC Pro).
Well Written Concise
Stuart Taylor:
I use flats, certainly. And flat darks. But I don't use darks or biases (they're not necessary with the 2600MC Pro).
They are.
I use flats, certainly. And flat darks. But I don't use darks or biases (they're not necessary with the 2600MC Pro).
Hmm... What makes you think you don't need darks for the 2600MC Pro?
AstroGeier:I use flats, certainly. And flat darks. But I don't use darks or biases (they're not necessary with the 2600MC Pro).
Hmm... What makes you think you don't need darks for the 2600MC Pro?
Apologies, let me correct that. I think biases are not necessary (as I take dark flats). I agree that darks are. But I use a dark library (as I tend to use the same exposure times and gains often)
I'd respectfully suggest you try stacking the file you've shown here without using any Darks or Flats or Anything and just see what the result is. This will at least give you a starting point for the camera's performance (which is quite amazing). Best to eliminate everything possible first!
Well Written Concise