"Blem" Lumicon Oxygen III filter(1-/4"); $55 shipped CONUS
(with orig case)
The blem is a very slight thinning of the coatings on the extreme outer edge on one side only. (You can only see the thinning by looking thru the surface; you cannot see the thinning at all on the surface.Should be fine for visual use and you won't notice any difference during observing.
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