A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2016 Oct 30, 13:09 -0700
The original MK3 filters for the index mirror generally hold up over time so shouldn't need mylar replacement. The Ebbco plastic sextants have filters which go bad over time and should be replaced as noted in a different previous thread.