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The OPTOLONG L-Quad Enhance Filter is a quad bandpass light pollution suppression filter designed for OSC cameras. It effectively reduces the wavelengths of light pollution generated by artificial lighting (including mercury and sodium lamps), as well as the impact of natural sky light on astronomical photography, thereby significantly enhancing the contrast and detail of celestial images. This filter is specifically optimized for the transmission of the H-α, H-β, OIII, and SII emisssion lines,
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