I don't know too much but the couple of rainbows that I have shot I have used a circular polarizer. It might not make too much of a difference, but it makes it pop a little nicer. Here is one I took in my pre d-slr days. It is not the best but I think it shows how the polarizer can help with the pop of the rainbow.[img]/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.23.29/P1040248.jpg[/img]


Panasonic DMC-FZ7 10.2mm F8 1/640