Background subtraction & darks vs. pixel removal
Posted: Sat Oct 14, 2023 7:23 pm
Hi Robin,
I got a few questions aiming to optimize my EAA imaging.
First, a few infos regarding my equipment: I‘m using a 10“ f/5 GSO dob reduced to f/3.75 with Starizona Nexus 0.75x CC/FR over a single-axis EQ platform. My skies can be classified as Bortle 6. The camera in use is an uncooled ZWO ASI533 MC, which exhibits very low read noise.
Regarding the darks vs hot/cold pixel removal:
So far, I‘ve used darks and usually take around 25 at my typical settings of 8s exposures at gain 300.
I was wondering whether my low read noise camera would do equally well if I only used the hot/cold pixel removal method? What would you say?
This would be favorable since at the moment, temperature usually drops over the night and the darks should not be as effective then?
Regarding the background subtraction:
Until now I‘ve mainly used „blended offset“, sometimes experience nasty gradients. Given my Bortle 6 skies and a few streetlights behind my house (not in direct sight of the telescope), what mode would you recommend?
Thanks in advance & CS
Johannes
I got a few questions aiming to optimize my EAA imaging.
First, a few infos regarding my equipment: I‘m using a 10“ f/5 GSO dob reduced to f/3.75 with Starizona Nexus 0.75x CC/FR over a single-axis EQ platform. My skies can be classified as Bortle 6. The camera in use is an uncooled ZWO ASI533 MC, which exhibits very low read noise.
Regarding the darks vs hot/cold pixel removal:
So far, I‘ve used darks and usually take around 25 at my typical settings of 8s exposures at gain 300.
I was wondering whether my low read noise camera would do equally well if I only used the hot/cold pixel removal method? What would you say?
This would be favorable since at the moment, temperature usually drops over the night and the darks should not be as effective then?
Regarding the background subtraction:
Until now I‘ve mainly used „blended offset“, sometimes experience nasty gradients. Given my Bortle 6 skies and a few streetlights behind my house (not in direct sight of the telescope), what mode would you recommend?
Thanks in advance & CS
Johannes