Circumpolar Star Trails -- Pentax 6x7 camera with 35mm full-frame fish-eye lens at f/5.6. Fujichrome 100F slide film and 2 hour exposure. Taken from home in July 2004. Aurora adds sky color.
Circumpolar star trails stacked with a comet-like effect, turning over a canola field in southern Alberta. A stack of several dozen 1-minute exposures with 10-22m lens at f/3.5 and the Canon 60Da camera at ISO 1600. Light is from the waning Moon off camera to the right.
Circumpolar star trails taken from 11:45 pm to 3:30 am, July 5/5, 2011, using 8mm Sigma fish eye lens and Canon 5D MkII camera, for stack of 275 exposures, each 40 seconds at f/4 and ISO 1000. Stacked with Chris Schur's Photoshop Action. There are also noctilucent clouds and aurora in the scene, looking north from home in southern Alberta, latitude +51°.
