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and Dia36mm unmounted filters
Modulation
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Optolong OIII 25nm Filter 60 Pagers and Dia36mm unmounted filtersThis premium Optolong Narrowband OIII filter is designed for nebula observation allowing 25nm bandwidth of light centred on a wavelength of 500nm through, which corresponds to OIII emission lines, and reducing 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 and the unwanted natural light caused by neutral oxygen emission in our
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