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Hoya Intensifier (Red Enhancer)

Sodium vapor lamps, which are used in street lights, cause much of the light pollution produced by cities. These lamps emit yellowish light with a wavelength around 589nm. Didymium is particularly good at blocking this wavelength and finds its way into many light pollution filters, including the Hoya Intensifier (also known as the Hoya Red Enhancer). Here are a few test results showing what the Hoya Intensifier can do to help reduce the effect of light pollution in your astro images.

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