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All Custom Scientific astronomical filters have IR blocking “built-in” so IR light does not contaminate today’s sensitive CCD detectors. When you use filters from Custom Scientific, you do not need any additional IR blocker filters. One exception is in the thickness-matched Clear filters which transmit all wavelengths from the UV to the far IR; they are clear, high-precision, optical windows designed to transmit all wavelengths of light without having to refocus when switching back to a color filter. The filters offered are the most commonly-used filters by research astronomers on a limited budget, by astronomy teachers, and by serious amateur astronomers. Narrowband filters are also useful for capturing high resolution images in cities and other areas with high contamination by unwanted light. Thus, they are effective light-pollution filters. Note : Illustration does not show the exact product.

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