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  • Chroma O-III filter, 8nm FWHM

    • OIII filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen.
    • At 656.3nm, a narrow-band emission filter is required to separate OIII from the SII doublet (671.6nm and 673.1nm).
    • Parfocal for systems f/4.0 or slower
    • Transmitted wavefront better than 0.25 waves/inch
    • Parallelism: less than 30 arcsec
    • Made in the U.S.A.
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