On Dec 23, 2010, at 8:38 PM, Paul Ewins wrote: > I'm not sure that I'm answering your question correctly, but I threw a whole > lot of assumptions at a spreadsheet and came up with the conclusion that in > that 1/250 sec the wheel rotated around 1/10 of a revolution. If I am > counting right there are 15 spokes in the wheels. During the 1/250 sec each > spoke travel a little bit further than the distance to the next spoke. This > means there are sections where it has doubled up (i.e. both the current and > previous spoke have occupied that position during the exposure) so you get > the "ghost" spokes as well as the uniform blur.
I'm too lazy to check the math, but that sounds reasonable to me. Does this effect happen at other parts of the track? Another possibility is that it has something to do with the focal plane slit, but I can't figure out how that might be. -- Larry Colen l...@red4est.com sent from i4est -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
