Iris Nebula (NGC7023)


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Sectional prints are available in dimensions that are multiples of 20cm (about 8 inches). The following sizes and prices are for example only. Please select the desired width below to get a quotation.

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80x60cm $90
120x80cm $140
160x120cm $210

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This combined image was made by stacking luminance frames at 2 different exposures for the background plus a third, shorter exposure just for the bright central region. The red, green and blue frames were then stacked and combined in the usual way, but filtered more than usual to remove noise. Finally, the color image was blended with the luminance image using Photoshop’s “color” blend mode. This produces an image that gets its sharpness from the luminance frames, with minimal color noise.

The nebula is about 1,300 light years from Earth in the constellation Cepheus. It was captured over several nights on two separate trips to Indian Trail Springs.

 Scope: AT111EDT at f/5.6
Mount: AP Mach1
Camera: QSI583
Exposure: LRGB, 4 hrs total


About Greg Marshall

I am a retired electronics engineer and after a few months of enjoying my leisure I began to miss doing product development. My astronomy hobby always needed new solutions to unique problems, so I decided that whenever I came up with a good solution I would try to make it available to others.

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