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Subject
M16
Date
11th August 2005
Telescope or Lens
TEC APO 140
Mount
Paramount ME
Camera
ST2000XM
Filters
Shculer 10nm Ha, Custom Scientific 4nm SII and OIII, TT Clear and Hutech LPR
Total Exposures L 110 min R (SII) 180 min G (Ha) 180 min B (OIII) 180 min
Sub exposure
22 x 5min
9 x 20 min
9 x 20 min
9 x 20 min
Binning
Luminance 1x1 at 1.56 arcsec / pixel. Narrowband 1 x 1 at 2.15 arcsec / pixel.
Field of view and resolution
Approx 41x 31 Arcminute. 1.56 Arcsec / Pixel
Comments  

The SII is assigned to the red channel, Ha to green, and OIII to blue.

This narrow band image of the Eagle nebula represents something of an experiment. I imaged the nebula through a set of narrow band filters as I have done before, but decided to try and add in some luminance to see if I could get some better detail and bring back the stars. Overall I would say that the stars have been reintroduced and are much brighter and numerous than with normal narrow band images. The detail is a bit subjective. I think that it is a little better, mainly due to the luminance and the better resolution used to take the luminance images. However, I do think that a little bit of the contrast that is a feature of the narrowband images has been lost. I would think that this is due to the general broad background light that is captured during luminance / clear filter exposures.