ZWO OIII 7nm 2in Filter


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    ZWO OIII 7nm 2in Filter

    NEW OIII 7nm Narrowband Filter from ZWO

    Starts shipping in February

    Also available in 2″ SHO set

    ZWO OIII 7nm 2in filter  increases the contrast between nebula and night sky by helping to reduce the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapour, and both high and low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).


    Name: ZWO Narrowband 7nm filter Set 2in

    Size: 2″

    Thickness: 5mm+2.5mm(thread)

    Thread: M48.5*0.75 male thread

    The ZWO  OIII 7nm 2in filter is designed for nebula observation allowing the 7nm bandwidth of light centered on a wavelength of 500nm through,  which corresponds to OIII emission lines, blocking out all other light.  Adding the ZWO O-III Narrowband filter to your imaging collection will help you go beyond the RGB imaging and will help capture your favorite nebulae in a totally new light, no matter how polluted your skies may be!

    Technical Data

    • FWHM:7±0.5nm
    • Fine-optically polished to ensure accurate 1/4 wavefront  over the both surfaces
    • About 90% transmission at major OIII line 500nm (OIII filter )
    • Infrared wavelength 700-1100nm cut-off
    • <0.1% transmission of off-band, OD3(Optical Density)
    Transmission Curve

    ZWO OIII 7nm 2in

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