No, this is not a mis-posted, "Where can I find Wratten #90 filter that Saint Ansel recommended?"
I discovered yesterday that Tiffen makes (and presumably distributes) Wratten filters. http://www.tiffen.com/products.html?...dakaccessories
I had no idea.
and sadly, due to their lack of use, they have gotten extraordinarily expensive:
I once had a pair of polarized glacier sun glasses that were extreamly dark like an amber wratten 90. Everything looked so beautiful, especially snow scenes on a clear sunny morning.