A Bicolour North America Nebula

Back to NGC7000, the North America nebula, this time with a Sigma 105mm f/2.8 lens. For this image, 10 x 5min images were captured through both H-alpha (used for the red channel) and OIII filters (for blue). The red and blue layers were then combined in the ratio 60:40 to make the green layer, and the R, G, and B were then assembled into the final image.

North America Nebula

At this time of year, as it never really gets dark, it’s best to keep to the brighter DSOs – at least that’s my excuse! Included in this post are two views of part of the North America Nebula, taken through the 80mm f/6 Equinox with the Atik 314L+. It’s a stack of 12 x 5min frames through a Baader 7nm Ha filter, and shows a lot of detail in the nebula.

I then took 6 x 1min each RGB frames, binned 2×2 to add colour. The colour image is perhaps less successful, mainly because of the blue haloes around the brighter stars; images through the blue filter were noticeably more bloated than through the red and green.

The North America Nebula – again!

The moon was up, and washing everything out somewhat, but having got my SCT somewhat close to collimated – good enough for guiding, at least – I thought I’d have a play around with NGC7000 again.
This is a combination of 13 x 2 min and 6 x 4 min exposures at ISO 800, taken through the Equinox ED80, captured and processed with Images Plus and Adobe Lightroom.

A bit more exposure would have helped, but I was quite pleased by how much detail I was able to tease out of it, nevertheless. Guiding worked flawlessly, possibly helped by the fact that I’d spent a bit of time improving my polar alignment.