BTW while we are on astro image manipulation, does anyone know of software that converts star-trail images back to points.    From Wordnik.com.  [Stunning New Looks at the Mars Avalanche | Universe Today] Reference

And all of the effects that would be impossible with a typical small camera - trailing car lights, frozen splashes, eight-second star-trail exposures - are easy to dial up with this one.    From Wordnik.com.  [The Globe and Mail - Technology RSS feed] Reference