NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Noell Wilson
Date: 2022 Oct 29, 10:14 -0700
I checked the ND1000 and it measures 0.0477” (1.21mm) thick at 4 places around to the best of my ability with a 0.001” micrometer. I’m estimating the 0.0007”.
Hopefully, current glass manufacturing has eliminated wegness these days. I’ll check the new one when it arrives.
I took the filter apart and the 40mm thread shell holds a 37.5mm diameter glass. Extending that, I ordered a 43mm filter and I’ll check it too. Trying to grind 0.5 mm off the diameter without breaking it may end the quest.
It looks like I may be buying some parts from C+P to get everything right.
My first experience with light leakage and the sun was with a zero magnification plastic sextant. It scared me when I thought of making that mistake with a magnifying telescope.
Regards, Noell
