can someone explain how the long exposure shot is taken, where the local light object (bulb) is not overexposed? everything seems to be perfectly exposed.
the only thing i can think of was that this image was constructed from multiple shots taken at different exposures.
“My star trail images are made by taking a time exposure of about 10 to 15 minutes. However, with modern digital cameras, 30 seconds is about the longest exposure possible, due to electronic detector noise effectively snowing out the image. To achieve the longer exposures I do what many amateur astronomers do. I take multiple 30-second exposures, then ‘stack’ them using imaging software, thus producing the longer exposure.”
http://www.flickr.com/photos/nasa_jsc_photo/sets/72157629726...