NGC 3372 Carina Nebula ( and Keyhole )
Posted: Fri Jan 27, 2023 5:02 am
A rare and unusual clear stable night during our summer ( Southern Hemisphere) presented itself, so took the opportunity to image. The moon was a decending slither in the west and gone by 10pm. Humidity was up around 89% and no wind but I’m baffled why there was little or no dew around. Another unusual phenomenon in summer , no mosquitoes or bugs ?? Anyway enjoyed the night immensely
NexDome Obs
Bortle 3 Sky
10” f5 Klaus Helmerich Carbon fibre Newt
Skywatcher EQ8-R pro mount
ZWO 2600MC cooled to -10C , Gain 101 ( I always add 1 digit just in case the ZWO HCG setting calibration is out on the driver , some folk add 5 )
TS Optics GPU coma corrector
Antlia ALPT 5nm Dualband OSC filter
EQMOD and Stellarium
APT
PHD2 Multistar guiding ( O.45 to 0.55 total rms ) smooth tight guiding ( image scale is 0.62 arc sec per pixel )
60 x 3 min dithered subs
40 x Flats
60 x Bias
Stacked in DSS
Processed in Startools v 1.8
I only processed in Synthetic Luminance so far , chasing more data to finalise the image with Color.
Used HDR tame to tone down the keyhole region which is always the brightest part.
Used Spatially Variant PSF Deconvolution again with excellent results ( this time as the data set was virtually without noise I did not use Binning but left it at native size ( huge image file ) Definitely SV Decon works better with low noise unbinned data. I did a re process with 50% Binning and the smaller stars ended up a bit blocky and some with artefacts in the cores when zoomed in.
The stars with no Binning are pin point , bright and round points of light , brilliant !!!
Iterations setting 15
Ringing 80% and 0.90
Sampling at least 25 stars with green cores ( plenty of great stars to choose from due to quality low noise unbinned data )
Original framed version
Crop version showing Keyhole Region
Comments most welcome
Thanks
Martin
NexDome Obs
Bortle 3 Sky
10” f5 Klaus Helmerich Carbon fibre Newt
Skywatcher EQ8-R pro mount
ZWO 2600MC cooled to -10C , Gain 101 ( I always add 1 digit just in case the ZWO HCG setting calibration is out on the driver , some folk add 5 )
TS Optics GPU coma corrector
Antlia ALPT 5nm Dualband OSC filter
EQMOD and Stellarium
APT
PHD2 Multistar guiding ( O.45 to 0.55 total rms ) smooth tight guiding ( image scale is 0.62 arc sec per pixel )
60 x 3 min dithered subs
40 x Flats
60 x Bias
Stacked in DSS
Processed in Startools v 1.8
I only processed in Synthetic Luminance so far , chasing more data to finalise the image with Color.
Used HDR tame to tone down the keyhole region which is always the brightest part.
Used Spatially Variant PSF Deconvolution again with excellent results ( this time as the data set was virtually without noise I did not use Binning but left it at native size ( huge image file ) Definitely SV Decon works better with low noise unbinned data. I did a re process with 50% Binning and the smaller stars ended up a bit blocky and some with artefacts in the cores when zoomed in.
The stars with no Binning are pin point , bright and round points of light , brilliant !!!
Iterations setting 15
Ringing 80% and 0.90
Sampling at least 25 stars with green cores ( plenty of great stars to choose from due to quality low noise unbinned data )
Original framed version
Crop version showing Keyhole Region
Comments most welcome
Thanks
Martin