Also, while sighting with the Cammenga I struggle to figure out what the thin sighting wire/thread is for. That sight slot is so close to my eye that it is completely blurred to me. Maybe its my old near-sighted eyes, but I asked my 13 year old son w/ no vision issues if he can see the thread and he says its blurry too.
The thin wire is to line your target up correctly through the sight window. Depending on the compass, say a Lensatic, you cock the cover plate with the sight window so its locked into place roughy 45* over the dial. You bring the compass to your eye, use the wire to sight your target and then look down to determine azimuth.
Think of it as a front blade sight on a pistol.
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