Quote Originally Posted by JG Motamedi
.005 ISO

But don't forget they are orthochromatic, and a meter reading will only indicate how much light, not what color.

Charlie Schreiner's site http://www.newdags.com/ has lots of information.
Thanks. I have been to the site and quite enjoy looking at their pictures.

An ISO of .005 will require some calculations but that is part of the fun, right?