The Big Dipper and a diffuse aurora over the old barn near home, in southern Alberta, on September 16, 2016. The waning gibbous Moon off camera at right provides the illumination. This is a stack of 5 exposures, averaged, for the ground to smooth noise and one exposure for the sky to keep the stars untrailed. All 13 seconds at f/2.8 with the Sigma 20mm lens, and ISO 1600 with the Nikon D750. Diffraction spikes on stars added with Noel Carboni’s Astronomy Tools actions.
The Big Dipper and a diffuse aurora over the old barn near home, in southern Alberta, on September 16, 2016. The waning gibbous Moon off camera at right provides the illumination. This is a stack of 4 exposures, averaged, for the ground to smooth noise and one exposure for the sky to keep the stars untrailed. All 13 seconds at f/2.8 with the Sigma 20mm lens, and ISO 1600 with the Nikon D750. Diffraction spikes on stars added with Noel Carboni’s Astronomy Tools actions.
A faint aurora glowing over the harvest in progress this night, with trucks and combines lighting the field at left, and the Harvest Moon itself - actually three days after Full Moon - lighting the scene at right. The combination of lighting from manmade and natural sources makes for an interesting illumination on the grain bins. The Big Dipper is left of centre, pointing down to Arcturus at far left, and Perseus is at right. The Pleiades are just rising over the far right bins. This is a 7-segment panorama, with the 20mm lens and Nikon D750. Stitched in ACR.
