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TS-Optics Variable Polarizing Filter for telescopes - 2" - variable brightness - for reduction of glare during lunar and planetary observing; fxp2: Amazon.de: Electronics & Photo
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Amazon.com : Celestron – Variable Polarizing Moon Filter for Telescopes – Fits 1.25" Telescope Eyepieces – Adjustable 1-40% Light Transmission – Perfect Filter for Moon, Venus, and Double Star Viewing : Electronics
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SVBONY Polarizer Lens Filters Variable Polarizing Filter 1.25" Optical Glass Lens Aluminum Frame for Astronomic Telescope Eyepiece Standard M28.5 Thread: Telescope Accessories: Amazon.com.au
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