Terry
I am quite prepared to let people do their own experiments and come to their
own conclusions on this matter. As of course Muybridge did, but that is a
very different story. I suggest we follow Steve's advice.
Peter Marshall
Fixing Shadows and elsewhere:
http://faraday.clas.virginia.edu/cgi-uva/cgiwrap/~ds8s/Niepce/peter-m.cgi