Starlight Xpress SXV-H9 CCD, Pentax 6x7 300mm/f4 lens at f4, Astronomik 12nm narrow band filters
Ha: 23x720s
O3: 24x900s
S2: 18x1200s
VIVAHA - Fotografía artística de Boda, audreyisawake, Cristóbal Alvarado Minic, rogonline, and 14 other people added this photo to their favorites.
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Dangerous Dave...
Member since 2007
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lacomj 30 months ago | reply
That makes sense. I too only get them when using a DSLR lens (and telescopes with chromatic aberration), hence in my DSLR shots, I had attributed halos to chromatic aberration and had it in my head that filters would take care of it. It seems that was not correct!
Do you know what band(s) the halos result from? I.e., which filter(s)? They do seem to be predominantly magenta (maybe some blue).
Dangerous Dave Astrophotography 30 months ago | reply
The magenta halos are not caused by the optics, I believe they are caused by the relative dimness of nebulosity with respect to stars in the O3 and S2 channels, hence having to push those channels harder, resulting in larger stars than the green, Ha channel.
A halo caused by the optics is visible around the brighter star top centre.
Chanctonbury 30 months ago | reply
Halos or not, it's a cracker of an image. I hear what you say about 'sterile' white stars although I try to tone down the magenta stars using 'colour noise reduction'. Either way, I love the detail you have captured in this image.
rocco parisi 30 months ago | reply
Very excellent work!
All versions are very interesting.
Complimentonissimi!!!