A strange red/magenta auroral arc overhead across the sky, with a more normal green diffuse glow to the north, as seen on May 10, 2015, in a stack of 80 frames taken over 45 minutes. The Big Dipper is overhead in the centre of the frame, Jupiter is at left in the west and Arcturus is at top to the south. I shot this from home, using an 8mm fish-eye lens to take in most of the sky, with the camera looking north. The 80 exposures were stacked and blended with Advanced Stacker Actions from StarCircleAcademy.com using the Long Trails effect. Each exposure was 32 seconds at f/3.6 and ISO 3200 with the Canon 6D. An individual exposure adds the more point-like stars at the start of the tapered star trails, and add the blue from the last twilight glow still illuminating the sky at the start of the sequence.
Circumpolar star trails spinning behind Double Arch at Arches National Park, Utah, as the waning gibbous Moon lights the arches toward the end of the sequence. The Big Dipper is streakng into frame at top right from behind the butte at right, while Jupiter is the bright object at top left streaking down into the scene. During the shoot, other photographers were lighting the Arches but this did not affect my shoot, as my foreground came from near the end of the shoot after they had all left and I had natural illumination to light the Arches. This is a stack of 160 frames taken over 2.5 hours from 9:30 to midnight, starting in moonless darkness, then brightening as the Moon rose in the last hour of the shooting, lighting the sky and arches. The nearest arch casts its shadow onto the distant arch, with its shadow shape matching the other arch. The frames were stacked with Star Circle Academy’s “Advanced Stacker Actions” for Photoshop using the Long Streaks effect. The foreground comes from a stack of 8 frames for noise reduction, taken toward the end of the shooting with the moonlight illumination. An additional frame taken a couple of minutes after the last star trail frame adds the short unstreaked stars at the head of the trails. Each exposure was 45 seconds at f/2.8 and ISO 3200 with the Canon 6D and 14mm Rokinon lens. Dark frames taken at the end of the night (8 stacked in Mean combine for a master dark) were also subtracted from each of the foreground and star trail stacks, which reduced noise speckling.
The Big Dipper over Double Arch in the moonlight, at Arches National Park, Utah, on April 6, 2015 with illumination from a waning gibbous Moon. This is a two-panel vertical panorama with the 24mm lens and Canon 6D, each panel a stack of 4 x 40-second exposures at f/4 and ISO 1600 to reduce noise in the landscape and shadows, but the sky coming from just one frame in each panel to keep the stars as points. Stitched in Photoshop with reposition command.
