Filtre S-II 7nm ZWO 50,8mm

The narrowband ZWO S-II 7nm filter is designed for astrophotography, focusing on a wavelength of 672nm. It can be used in combination with H-Alpha and O-III filters to produce "Hubble-like" images. By selectively reducing the transmitted wavelengths, this filter eliminates public lighting effects.

Technical Characteristics

Central Wavelength: 672nm FWHM (Full Width at Half Maximum): 7nm (+/-0.5) Infrared Cut-off: 700/1100nm Transmission: 90% on the S-II line (672nm) Schott glass, thickness: 1.85mm Precise optical polishing to ensure a precise wavefront at lambda/4 and parallelism <30" arc on both surfaces Double-sided optical coating Anti-reflective treatment

Construction

The aluminum cell is manufactured by CNC machines that impose high precision in fabrication. The filter is available in 4 formats: unmounted 31.7/50.8mm and 31mm/36mm circular.

Compatibility

The S-II 7nm ZWO 50.8mm filter is compatible with various types of equipment: CCD Imaging: excellent for enhancing the contrast of nebulae Digital Photography (unmodified camera): good, although the sensitivity of unmodified sensors is reduced in SII Digital Photography (modified camera): excellent for enhancing the contrast of nebulae