A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Geoffrey Kolbe
Date: 2018 Oct 27, 10:29 -0700
My take on this is that the combination of a red and green filter will make a very opaque filter for the clear sun. Too, opticians use red and green colouring to determine if the lens correction in place is slightly too strong or too week. Individual users may find that using a red of green filter will give a sharper image.