120602 Moonset over Lk Palestine
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ASTRO:
type=Lunar nightscape IMAGE: long exposure; DSLR OSC: 1x25s, f/4.2, ISO3200 EQUIPMENT: camera=Nikon D90 (stk); optics=NIKKOR 18-70mm DX kit zoom @ 50mm; filter=(none); mount=simple tripod; guider=(none) SOFTWARE: acquisition=(in-camera) processing=PhotoshopCC |
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At the root of Astrophotography is the study of long-exposure photography. Here, a 25 second exposure of the moon as it is setting below the western horizon results in an image that appears for all intents and purposes like a normal daytime sunset. But this exposure was taken at 3:14 AM at night, well after the preceding sunset, and well before the following morning's sunrise.
The tell-tale signs that there is something different about this image include the green hue in the trees across the lake, which is due to a mercury-vapor guard-light illuminating a neighbor's backyard; and, the silky sheen on the water surface which is due to the motion of the water becoming "smeared" in the long exposure.
The tell-tale signs that there is something different about this image include the green hue in the trees across the lake, which is due to a mercury-vapor guard-light illuminating a neighbor's backyard; and, the silky sheen on the water surface which is due to the motion of the water becoming "smeared" in the long exposure.