![]() To image this object I collected 40 minutes of monocamera BLUE filter light, 70 minutes of mono-camera HA light, 70 min of OSC camera UHC-filtered light and ~ 180 min of unfiltered RGB OSC camera light mainly using an F4 VX12 Newtonian (set up as previously described). One simplifying factor is that there appears to be negligible OIII. ![]() ![]() The flaming star and surrounding HII region IC405 is one such example and I have been back and forth trying different recipes unable to decide.Īs a bit of background this comprises a reflection nebula (implying the presence of dust) illuminated by a very bright young type O star, AE Auriga, surrounded by a 5 ly type II region also illuminated and ionized by AE Auriga. So for example objects like M1 that combines narrow band with broadband synchrotron blue light or whereever reflection nebula get mixed up with HII regions. However image processing and colour choices that provide a consistent, scientifically meaningful and preferably 'naturalistic' representation seems to get more complicated where (ignoring the stars ) the object of interest combines both monochrome NB and broadband sources of light. Star clusters and galaxies - RGB plus optionally NB enhanced HA features - or Wolf Rayet nebula for example where just OIII and HA narrowband will suffice to capture most all of the 'interesting' visible light with which to form an image. ![]() For some objects it is relatively easy to make choices about the most appropriate coloration. ![]()
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