Yes Mike, there is a cone behind the spot which probably flairs out another couple of mm. (I never took any notice until you pointed it out) 40% obstruction appears to be a gross exaggeration and I strongly doubt that I would get the crisp views that I do.
Like you, I always use the word "crisp" when talking about the views through this scope. The quality of the optics, the "crisp" views and quick setup are definitely the strong points of this scope.
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