Photo Composite (blended exposures). Comet NEOWISE (C/2020 F3) over the badlands formations at Dinosaur Provincial Park of Alberta in July 2020, with the Big Dipper above it. A very active thunderstorm system moving northeastward this night but well to the west of me lights the horizon. Parallel bands of red and green airglow tint the sky, as does the blue of lingering summer twilight. Even with the bright sky the comet’s blue ion tail can be traced up to and past the Bowl of the Big Dipper.

This is an exposure blend, with the landscape from a stack of seven exposures from 2.5 to 3.5 minutes long at f/2.8 and ISO 1600, stacked to smooth noise, blended with a single untracked 30-second exposure for the sky at ISO 6400 at f/2, all with the Sigma 24mm lens and Canon EOS Ra camera. The ground is illuminated by starlight and sky light only; no light painting was used here. Topaz DeNoise AI applied to the sky; Sharpen AI applied to the ground. Some light sculpting applied to the ground with a Dodge and Burn layer and a luminosity mask, to make the foreground less flat in lighting.



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