ZWO 36mm H-Alpha, SII, OIII 7nm Filter Set

Astrophotography Enhancement: Specifically crafted for nebula observation, this set includes H-Alpha, SII, and OIII filters, each with a 7nm bandwidth.
Contrast Improvement: These filters intensify the contrast between nebulae and the night sky without increasing their brightness, offering clearer images.
Light Pollution Reduction: Effectively minimizes interference from artificial light sources like mercury vapor and sodium vapor lights.
H-Alpha Filter: With a bandpass of 7nm, it allows 80% light transmission at a 656nm wavelength, ideal for high-contrast imaging in light-polluted areas.
SII Filter: Targeting 672nm wavelengths, it's perfect for detailed observation of emission nebulae, planetary nebulae, and supernova remnants.
OIII Filter: Focuses on a 500nm wavelength, corresponding to OIII emission lines, effectively blocking other light sources for clearer nebula images.
Versatile Imaging Options: Suitable for both visual observation and tricolor CCD astrophotography, particularly effective with the SHO set (H-alpha, OIII-CCD, SII-CCD).
Hubble-Inspired Imaging: Combine these filters to replicate the iconic Hubble Space Telescope imagery like the "Pillars of Creation" in the Eagle Nebula.
Low Light Capability: These filters enable astrophotography even under the presence of the moon or in heavily light-polluted areas.
Natural Imaging Enhancement: The H-Alpha filter can be blended with RGB data to enhance structural details while retaining a natural appearance.

This ZWO filter set is an essential toolkit for astrophotographers looking to capture the majesty of the cosmos with enhanced clarity, contrast, and color fidelity.

Specifications

FWHM：7±0.5nm
Glass Thickness 2.0+/-0.03 mm (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 36mm Ha SII OIII 7nm filter set

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