Optolong L-Pro Filter for Deep Sky narrowband Imaging - 2" Vixen -2x William Optics 20 mm
USD194.00
USD234.00
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Optolong L-Pro Filter for Deep Sky narrowband Imaging - 2" Vixen -2x William Optics 20 mm1. Optolong L Pro Introduction Optolong L Pro (L Professional) filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i. e. skyglow). Together with
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