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CHAMÄLEON + ONJALA OBSERVATORY DeepSky | SITEMAP HOME CHAMÄLEON |
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| The image processing of narrow-band images is fundamentally different
from the classic processing of RGB or LRGB images. This is due to the fact that
narrow-band images "capture" specific emission lines that must be separated
from the eye in their later visual representation. However, this is not always
easy, since, for example, the emission line of sulfur-II is very close to that
of hydrogen-alfa, as well as nitrogen-II. These lines are all red for the human
eye. A detailed description of the technique of narrow band photography can be found here. |
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| NGC 3372 H-SHO |
IC 4628 H-SHO |
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| NGC 6334 H-SHO |
NGC 6357 H-SHO |
NGC 6188, NGC 6164/65 und 6193 H-SHO |
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Test image Messier 17 with STC Duo Narrowband
Filter With an exposure series of 32x5min M17 was exposed with the cooled ASI 071 through an STC duo-narrowband filter. This filter allows a limited amount of Ha AND OIII to pass through at the same time and thus exposes the red pixels of a Bayer matrix with Ha light and the blue pixels with OIII light simultaneously. The total exposure effort compared to a black/white camera in combination with single color filters is therefore no longer significantly different. In this example the two spectral lines are already separated quite neatly. The green pixels of the Bayer matrix hardly pick up any overlapping signal. Thus we recognize the actually very classical bicolor variant. However, a classic Hubble palette is withheld from this setup. There is no way around using a black/white camera with filter wheel and spectral line filters, because the light of the double ionized sulfur (SII) is exactly |
Messier 17 - load large images (1800 x 1350 Pixel) (2400 x 1800 Pixel)
Image data - Exposure: SII(20x180s), Ha(20x180s), OIII(20x180s), Filter: Astrodon 3nm, Camera: ASI 1600-MMpro, Telescope: 105mm Pentax - with Reducer at f/5 Object description on NGC 3372 here ...
Image data - Exposure: SII(30x180s), Ha(30x180s), OIII(30x180s), Filter: Astrodon 3nm, Camera: ASI 1600-MMpro,
Telescope: 105mm Pentax with Reducer at f/5
Image data - Exposure: SII(22x180s), Ha(22x180s), OIII(22x180s), Filter: Astrodon 3nm, Kamera: ASI 1600-MMpro,
Telescope: 105mm Pentax with Reducer at f/5 Object description on NGC 6334 here ...
Image data - Exposure: SII(19x180s), Ha(19x180s), OIII(17x180s), Filter: Astrodon 3nm, Camera: ASI 1600-MMpro,
Telescope: 105mm Pentax with Reducer at f/5
Image data - Exposure: SII(20x180s), Ha(20x180s), OIII(20x180s), Filter: Astrodon 3nm, Camera: ASI 1600-MMpro,
Telescope: 105mm Pentax with Reducer at f/5 Object description on NGC 6193 und NGC 6188 here ...
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