I know the 'redhancer' / enhancer / intensifier filters are made of didymium / neodymium, but I can't find any info on the kind of glass used in the greenhancer / "green field" / bluehancer type filters.
Thanks
gHaggy
Favorite Answer
Didymium is an old term and is actually a mixture of the elements praseodymium and neodymium. Different ratios of the two elements will have different effects is glass. For example, a 1:1 ratio will produce a glass that can change colors between amber, reddish, and green depending on the light source that strikes it. So, it may be that the other enhancing filters are just different ratios of the same elements.