Hi Dave, Yes I was assuming that you were taking lightning pictures at night (I somehow missed the word dusk). I should have also said to use a normal or wider lens to increase your chances of capturing a strike. It is tough to point a telephoto lens at the right spot but with some storms when the strikes are repeating in the same area this can be done. Daytime lightning does make it more difficult. In that case I would set the ISO at the lowest setting available (100, 200) and expose for the sky (meter the lightest part of the sky and open up 1/2 to 1 stop according to the tonality of the sky at the time). If there is too much light in the sky it will be tough to get the strikes to show up well.
There is a device that you can purchase for aiding you in capturing daytime strikes. I think it was advertised in Outdoor Photographer magazine (can't remember the name right now, list?). Charles
