Quote:
Originally Posted by AstralTraveller
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Thanks David.
Notes from my flickr image ...
A deep look at Omega Centauri ( NGC 5139 ) - by Mike O'Day
This image is an attempt to look deeply into the mighty Omega Centauri star cluster and, by using HDR techniques, record as many of its faint members as possible whilst capturing and bringing out the subtle colours of the stars, including in the core.
Image details:
( from nova.astrometry.net )
Size: 58.6 x 39 arcmins,
Centre: 13h 26 min 50.4 sec, -47deg 28' 39.1''.
Orientation: up is -89.9 East of North ( ie. E^ N> ).
Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ).
Corrector: ASA 2" Coma Corrector Quattro 1.175x.
Effective Focal Length / Aperture : 1410mm f4.7.
Mount: Skywatcher AZ Eq6 GT.
Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2 .
Camera:
Nikon D5300 (unmodified) (sensor 23.5 x 15.6mm, 6016x4016 3.9um pixels).
Location:.
Blue Mountains, Australia.
Moderate light pollution ( pale green zone on darksitefinder.com map ).
Capture:
9 sets of sub-images with exposure duration for each set doubling ( 1s to 240s ) all at ISO800.
Processing:.
Calibration: master bias, master flat and no darks.
Integration in 9 sets.
HDR combination.
Pixinsight
May 2017