ZWO 7nm NarrowBand SHO Set 1.25": Revolutionizing Nebula Imaging

Selective Light Transmission: Designed to selectively reduce transmission of certain wavelengths, particularly those from artificial lights like mercury vapor, and sodium vapor lights. Also minimizes natural light pollution caused by atmospheric oxygen emission (skyglow).
ZWO H-Alpha Filter: Features a 7nm bandpass, allowing light at 656nm wavelength. Its light transmission rate soars up to 80%, making it ideal for high-contrast H-alpha astrophotography, even in light-polluted areas.
Enhanced Nebula Contrast: Dramatically improves the contrast between nebulae and the night sky, without artificially brightening the nebula.
ZWO S-II 7nm Filter: Tailored for nebula observation, this filter transmits light at 672nm wavelength with a 7nm bandpass. Optimal for studying emission nebulae, planetary nebulae, and supernova remnants, especially when combined with H-alpha and OIII filters for tricolor CCD astrophotography.
ZWO O-III 7nm Filter: Specialized for nebula observation, it permits a 7nm bandwidth of light centered around a wavelength of 500nm, corresponding to OIII emission lines, while blocking other light. This filter is a key tool for transcending traditional RGB imaging and capturing nebulas in new, striking ways.
Ideal for Polluted Skies: These filters are specifically designed to function effectively under heavily polluted skies, allowing astronomers and astrophotographers to capture detailed and contrasting images of their favorite nebulae.
Comprehensive SHO Set: The set's combination of H-alpha, S-II, and O-III filters opens up a plethora of possibilities for imaging various deep-sky objects, offering a complete solution for advanced astrophotography projects.

Specifications

Name: ZWO New narrowband 1.25″ filter

Size: 1.25″

Thickness: 5.5mm+2.5mm(thread)

Glass thickness: 1.85mm

Thread: M28.5*0.6 male thread

FWHM：7±0.5nm
Glass Thickness 2.0+/-0.03 mm (1.25”/31mm/36mm)
Fine-optically polished to ensure accurate 1/4 wavefront over the both surfaces
About 90% transmission at H-alpha line 656nm (H-Alpha filter )
About 90% transmission at SII line 672nm (SII filter )
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)

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ZWO 7nm NarrowBand SHO Set 1.25"

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