H-Alpha Filter 7nm 31mm Circular Unmounted for Astrophotography - ZWO

Improve your astrophotography with the ZWO 7nm 31mm circular unmounted H-Alpha filter. Designed to capture nebulae emitting in hydrogen alpha at 656nm, this narrowband filter offers exceptional contrast, ideal for revealing the finest details of the deep sky.

Characteristics :

• Central wavelength : 656.3nm (H-alpha)
• Bandwidth : 7nm (FWHM)
• Transmission : 90% on the H-alpha line
• Glass : High-quality Schott, thickness 1.85mm
• Optical polishing : Precise wavefront at λ/4, parallelism <30" arc
• Coating : Double-sided anti-reflection coating, infrared cut-off (700-1100nm)
• Format : 31mm circular unmounted

Advantages :

• Improved contrast : Reveals the extensions of hydrogen nebulae with increased clarity
• Light pollution reduction : Effectively suppresses the effects of public lighting and moonlight
• Superior image quality : Reduces the intensity of bright stars for more detailed images
• Versatility : Ideal for creating "Hubble-like" images in combination with O-III and S-II filters

Compatibility :

• CCD imaging : Perfect for dedicated astrophotography cameras
• Digital photography : Excellent performance with modified DSLRs for increased H-alpha sensitivity
• Accessories : Compatible with filter wheels accepting 31mm unmounted circular filters

Tips for use :

• Urban astrophotography : Ideal for photographing from areas with light pollution
• Filter assembly : Combine with O-III and S-II filters for spectacular false-color compositions
• Not suitable for visual observation

The filter is not mounted. The photo shows a mounted filter.