Would a magenta filter work for increasing contrast...

[Steven Ruttenberg]

Those filters are very expensive and usually small diameters, and would turn the moon cyan if you looked at it through a telescope...

The Hoya I mentioned is a dichroic filter not really different from them, but at a much lower cost... So worth a try...

They balance night color surprisingly well, but some stuff turns cyan or other colors...

Steve K

The ones am referring to come from Astronomik and are.made such that tbey are balanced for o servational astro omy or photography.and will have little if any color shift according to the maker. Plus they can be had I believe in 100mm square filters, attach to image sensor in divital camera and can be made with almost any filter ring size. According to them you can photograph the heavens and planets well with them. I want to try them for bw pbotography to tame the sodium vapor lamps along the streets.

And yes, pricey like 180 for filter to go over camera sensor.