Eine städtische Landschaftsfotos der Sternbilder Orion und großer Hund über die Skyline von Calgary am Januar 18, 2018, auf eine sehr klare und Mondlosen Winte
3605 x 5400 px | 30,5 x 45,7 cm | 12 x 18 inches | 300dpi
Aufnahmedatum:
18. Januar 2018
Weitere Informationen:
An urban nightscape of the constellations of Orion and Canis Major over the skyline of Calgary on January 18, 2018, on a very clear and moonless winter night, allowing stars to show up fairly well despite the light pollution. Sirius is above the Bow Tower building at left. I shot this from Crescent Road on the north bank of the Bow River, with Orion nearly due south as high as it could get. So this is a real scene, not a faked composite with a sky shot someplace else or at some other time layered in. However, the view was helped by the use of a NISI Natural Night light pollution filter on the lens which helped filter out the yellow emission lines from sodium vapour lights, and rendered the sky a more pleasing blue tint (this is not from moonlight). The faintest stars are about magnitude 7.5, not bad from a city site, though this was a very clear, haze-free night, the sky factor. In addition, the sky is a longer single exposure of 10 seconds at f/2.5 and ISO 400 (which brought out the stars more but overexposed the skyline), while the skyline is a stack of 4 x 3-second exposures at f/2.8 and ISO 400 (to better expose for the bright lights). This composited accommodated the huge range of brightness of the scene. something like an HDR blend. I shot this with the 24mm Sigma Art lens and Nikon D750. I added the star diffraction spikes for artistic effect using Astronomy Tools actions.
