1¼" Contrast Booster Filter that completely eliminates false colour Removes the bluish "hue" (=lack of contrast) during lunar, planetary, solar and terrestrial observation Boosts contrast and sharpness for fast achromatic telescopes - with over 95% transmission Plane optically polished, non-ageing sealed coating edges Baader Planetarium 2458360 Contrast Booster Filter 11/4 Inches
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