[Stephen Benskin]

Interesting. We certainly have a lot to choose from, including my own tests. Although the feedback we get from people might be quite negative.

With a quick search, there's:

http://www.jerryo.com/formula/z_speedtest.html

http://www.halfhill.com/speed1.html

http://myplace.frontier.com/~cmp2f7cw/10/id1.html

http://www.lg4mat.net/page8.htmlhttp://www.davidkachel.com/historical/film_spd.htm