ZWO H-Alpha SII OIII filter set 36 mm unmounted filters includes three narrowband interference filters (H-Alpha 656 nm, S II 672 nm, and O III 501 nm) that suppress light pollution and capture faint nebulae with high contrast. With a 7 nm bandwidth, you precisely utilize the emission lines of hydrogen, sulfur, and oxygen in H II regions, supernova remnants, and planetary nebulae. These filters are parfocal with ZWO LRGB sets, allowing you to switch without refocusing.
Key benefits
✓ Narrowband H-Alpha, S II, and O III filters for maximum contrast enhancement
✓ 7 nm FWHM bandwidth minimizes ambient light without signal loss
✓ Parfocal design matches ZWO LRGB and color filters; no refocusing needed
✓ Unmounted 36 mm filters for any standard filter wheel
✓ Aluminum housing ensures sturdy, reflection-free mounting
Practical application
Combine with a monochrome ZWO ASI camera and filter wheel for automatic switching. Capture delicate nebula structures in Orion, Veil, and Ring Nebula with exceptional detail and contrast, even under urban skies.
Technical specifications
- Format: 36 mm unmounted filters
- Filters: H-Alpha 656 nm, S II 672 nm, O III 501 nm
- Bandwidth (FWHM): 7 nm
- Transmission: 80%
- Glass thickness: 2 mm
- Housing: aluminum
- Application: narrowband astrophotography (photographic)
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