a couple of nights ago I finally had a crystal clear night after weeks of clouds, so I decided to pull an almost-all-nighter and image something from my balcony.
The targeted DSOs were the Heart and Soul nebulae. Here's the hardware I've used:
- Nikon D7500 stock
- Tamron 150-600 G2
- iOptron SkyGuider Pro
- Bortle 5/6 location (SQM 19.63)
- 177 lights @ 170mm, ISO 100, f/5, each 1m45s long
- 20 darks taken after the lights
- 75 flats taken the next morning using a lightbox (this one in particular: https://www.amazon.com/NXDRS-Tracing-Ut ... B07D57BQM6)
- 75 dark flats taken after the flats
- final_ST.jpg is the file just out of StarTools
- final_ST_GIMP.jpg is the file sharpened and hue-saturated using GIMP
- stacked_dss.FTS is the stacked file using DSS as per the workflow on startools.org
- stacked_astap.fits is the stacked file using ASTAP as per the workflow on startools.org
- a single raw file for each type of frame (light, dark, flat and flat dark)
Code: Select all
autodev -> keep bin -> 60% -> keep crop -> keep wipe -> do -> keep autodev -> redo global stretch -> keep contrast -> dark anomaly filters 3 -> do -> keep Sharp -> next -> keep Color -> dark saturation 3.10, saturation 240%, green bias reduce 1.98 -> keep Life -> less=More -> do -> keep Entropy -> Dark/Light 70%/30% -> do -> keep Tracking off -> grain removal: grain size 2 pixels -> next
I know also that I should have taken at least 3 times more data, but that was the only single clear night I had in a while (and probably the only one for still a while)
Now some questions for you:
- are my calibration frames well taken? Or did I do something wrong with darks/flats/dark flats?
- why do I have so many green pixel in my final result? Is it because I need way more signal?
- why do I have this dense stars bloat in my final image? Is it because of the lens/too few signal/etc? I see online pictures with way less stars, how is it achievable without using software? Or is it just post-processing stuff?
- can I add extra data next time I will have a clear night? If yes, is it gonna be a problem if I have to re-focus because in the meanwhile I will have used my lens for other stuff? Getting the same f-ratio and focal length is not a problem, but same focus is never gonna be possible.
- with the data I have, how is my final result? Can it be improved? If yes, how?
- any other feedback for me?