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Pelican Nebula in H alpha, OIII and CLS light

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About this observation
Observer
David Arditti
Time of observation
04/09/2018 - 03:00
Object
Pelican Nebula
Observing location
Edgware, Middlesex, UK
Equipment
81mm apochromatic refractor
Field flattener
Artemis 285 mono camera
H alpha, OII and CLS filters
Exposure
Total 2 hours 24 mins
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This is an update to the image of IC 5067 I posted on 3 September.

That consisted of H alpha and CLS (light pollution filter broadband) light. On 4 September I added just 20 minutes exposure through an OIII filter. There is very little emission from the nebula in OIII, but using this, in lieu of a green or blue filter which would take in a lot more light pollution, has allowed me do construct a more 'real' false-colour image. The image uses H alpha as red, OIII as blue, and a mixture of OIII and CLS as green. In addition CLS is used as a luminosity layer. H alpha and OIII images were captured with 2x2 binning, but the CLS was unbinned. Corresponding dark and flat fields were used to calibrate all images. The images were captured using Nebulosity software, stacked in DeepSkyStacker, and combined and adjusted using Photoshop CS4.

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