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Baader 2 inch polarizing filter - suitable filter for solar and lunar observation and contrast enhancement in planetary observations. The brightness can be so adapted to particular magnification To screw in 2 inch eyepieces - e.g. for the Baader Herschel Prism Used for continuous brightness setting of the solar image Important. Polarizing filters may NOT be used for sun observation WITHOUT additional filtering in front of the eyepiece of the telescope. When unfiltered sunlight hits the dark filter, the heat will shatter it immediately. Scope of delivery: Baader polarizing filter 2 inch (single)