Optolong O-III 18nm Light Pollution FilterDescription The O III 18nm filter is designed for nebula observation, NOT for imaging. It transmits 18nm bandwidth, centered on a wavelength of 500nm, which corresponds to OIII emission lines. It also reduces the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights, as well as the unwanted natural light caused by neutral oxygen emission
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