When the post involves a BBC, I usually don't answer it at all. Pat McCarthy knows waaayyyy more about them than I do, so I defer to him.

I will join in on this one, but only to post a tutorial from Iskenderian so that you have a contrarian point of view. You know me, always the contrarian.

Please scroll down and read Tech Tip 2003 here.....
http://www.iskycams.com/techtips.php