H-Alpha 7nm Filter ZWO 50,8mm

The ZWO H-alpha 7nm narrowband filter is designed for astrophotography focusing on a wavelength of 656nm. It can be used in combination with O-III and S-II filters to achieve "Hubble-like" images. By selectively reducing the transmitted wavelengths, this filter suppresses the effects of public lighting and the Moon.

Technical Characteristics

• 90% transmission on H-alpha line (656.3nm)
• Bandwidth: FWHM 7nm (+/-0.5)
• Infrared cut-off (700/1100nm)
• Schott glass
• Glass thickness: 1.85mm
• Precision optical polishing to ensure accurate wavefront at lambda/4 and parallelism <30" arc on both surfaces
• Dual-side optical coating
• Anti-reflection treatment
• Cell construction in CNC-machined aluminum