On Thu, January 27, 2011 23:06, Herschel Mair wrote: > Andy, something right up your alley! > > I want to measure flash duration of an old dynalite head and pack. > > What can I shoot in the dark that moves at a constant speed and is > really cheap? The old answer was "your turntable". Most people don't have one these days, though. I can't think of anything that moves at a well-calibrated speed that's a common household object today. That's probably just lack of imagination on my part, though. -- David Dyer-Bennet, dd-b@xxxxxxxx; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info