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1.25''/2''/EOS-C CLS Light Pollution Broadband Filters Ultra High Contrast Filter Reduce Light Pollution
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Optolong CLS (City Light Suppression) broadband filter is designed to improve the visibility of various deepsky objects.-Optolong Optics Co.,Ltd.
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SkyTech vs Astronomik CLS-CCD filters for city imaging - DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging - Cloudy Nights
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