Quote:
Originally Posted by TheDecepticon
Ha ha!  I tried to do 6357 last night also, with my QHY8 that arrived Thursday from Gama. Great service and expedient delivery! 
I have had all the trouble in the world doing the flats until I contacted a more experienced imager. I had an ok colour to the nebula, but I had red rings around the edges of my image. I too thought that the transition from DSLR to QHY8 was gonna be easy,  WRONG ! What software are you using to capture & stack your files?  |
This can happen during calibration when you subtract the bias and end up with a negative ADU in the dark areas. All you need to do is a pixel math on your subs to add the negative offset. Aim for 100ADU overall then resave your file as a 16bits FITS, DDP again and you'll be back in business. No fringing or funky colors anymore
