This is a lumicon deep sky filter cosmetic 2nd. No visible marks or blemishes are present. Excellent for use on 35mm camera lenses when taking piggyback or widefield shots. If your lens isn't 58mm, a setup/down ring can be purchased very inexpensively to adapt. I would like to do an even trade for a 1 1/4" OIII filter, or sale for $78 shipped to you. SALE PENDING.