William Peifer wrote: > The picture on the NASA site is described in the caption as a time-lapse > sequence. Typically, shots like these are taken through a very strong > filter (typically an optical density of 5 or so, corresponding to a filter > factor of ~100,000).
I remember a guy on a newsgroup a couple of years back, he wanted to set up his camera to take an all-day exposure of the sun tracing its path across the sky while exposing properly for the foreground, using a very strong ND filter. I do not know if he actually did this or not. The reciprocity effects would make things difficult to say the least... Cheers, - Dave - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
