Amen to this. I'm new at this, and for a while was satisfied with my loupe. But recently spent more time examining the GG, and noticed I wasn't seeing it quite clearly. So i dialed the diopter in clearly as described. Then I put a teenie drop of white paint on both the moving barrel and the non-moving barrel to mark The Spot of Clarity.
Now, first thing when i pull out the loupe is to confirm the white spots are aligned. Then all good.
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