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Baader 11/4 Inch Polarising Filter - Ideal filter for observing the sun and moon and enhancing the contrast when observing planets. Brightness adjusts according to magnification Can be screwed into 11/4 inch ocular lenses, e.g. for the Baader Herschel prism Allows you to gradually adjust the brightness setting for the sun's image Important note: When observing the sun, polarising filters may NOT be used WITHOUT extra filtering in front of the ocular lens in the telescope. Baader Planetarium Polarising Filter 31.8mm