The Chroma H-Alpha 3nm Filter is essential for ultra high contrast images of nebulae under high levels of light pollution and Moon light. Normally used in comjunction with Chroma 3nm OIII and 3nm SII narrowband filters to create composite images.
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The Chroma OIII 5nm Filter isolates the 500.7nm primary emission line of doubly ionized oxygen, which is the second most important imaging line after Ha.
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The Chroma SII 5nm Filter is essential for imaging objects rich in ionised Sulphur in light polluted areas and in moonlit conditions. Partners well with the Chroma 5nm Ha and OIII filters.
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This product has multiple variants. The options may be chosen on the product page