Originally Posted by obscura_68
actually I went through the filters and have them from a no. 0 to a no. 106 and lots in between. I found a few around no. 87, the IR ones.
Well, stick to them! As long as they are properly cared for (with the appropriate holder, handled in gloves, stored cool, dark and dry) they are optically superior to glass filters - they are the reference colours the glass filters try to emulate.