This image was shot last week from Russian Ridge in Bay Area, California. The sky in image is a stack of 20 images (each shot at 24mm, f/2.8, ISO3200, 25s using Canon 6D with 24-70mm f/2.8L USM mark II). Images were stacked to reduce noise in sky. Foreground was shot at the same time, same place (24mm, f/2.8, ISO 800, 120s using same setup as above). Basic editing was done in Lightroom CC and then stacked using Photoshop CC.