Tarantula Nebula in SHO (robonrome)

Tarantula Nebula in SHO

Revision title: Recovering core detail with shorter exposures blenced into original

Perhaps the rainiest summer east coast Australia has had in a decade or more, so few even partly clear nights to play with... as such decided to focus on an object that is currently well placed for the entire evening so could let things run all night and pickout the good subs... this was over five nights and managed to get around 23 hours worth of useable subs.

Also this marks the return of my CEM70 from repair. Seems to be working better now although still some tweaking to do as some imbalance of RA to DEC... not that the RA is bad, more the DEC is just better... RMS running typically 0.6-0.7 which is good enough for me, it is just when RMS is closer to 0.5 that might be 0.2 DEC and 0.4 RA. Still happy enough with the results.

The central core nebular brightness of the Tarantula is considerable and tends to burn out in SHO length exposures so tried two things here, one running camera at zero gain to get the max dynamic range using 4min expsoures and also to run a couple of hours of 60s expsoures to try and protect central highlights.

Stacked in APP separating the result for the 240s and the 60s expsoures and processed each stack separately in Startools pushing the stretch on the longer exp stack and puling back on the short exp stack to keep those highlights. I then combined as a manual HDR blend in PS and tweaked to taste.

I think more can be done here to get highlight detail, maybe 30s or 15s exposure, but read noise starts to cause problems at such short expsoures at zero gain anyway. Something to explore in future. [EDIT have now revised blending in core highlight detail from 30s exposure stack x 100]

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Title: Recovering core detail with shorter exposures blenced into original

Description: Have attempted to recover highlight detail in the core by running another 50m of 30s exposures in Ha and OIII and blending these in to the original - just the core area.

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Status	Basic success
Started	...
Astrometry.net job	5331653
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Tarantula Nebula in SHO

Revision title: Recovering core detail with shorter exposures blenced into original

Tarantula Nebula in SHO

Revision title: Recovering core detail with shorter exposures blenced into original

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Tarantula Nebula in SHO

Revision title: Recovering core detail with shorter exposures blenced into original

Tarantula Nebula in SHO

Revision title: Recovering core detail with shorter exposures blenced into original

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