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With a 26mm effective aperture and >OD5 cutoff depth, SV227 1.25'' SHO Narrowband Filter Set effectively blocks city light pollution for an enhanced stargazing experience. SV227 1.25'' SHO Narrowband Filter Spectrum; Peak Transmission Rate: T ≥ 90% 90% transmission means the filter also blocks the light from mercury and sodium vapour lamps,blocks the light pollution of the city. With a Cut-off Depth ≥OD5, it effectively blocks unwanted light, ensuring pure, clear stargazing. The SV227 1.25'' SHO Narrowband filter is designed for nebula observation. Specification Filter Diameter Φ31.75x7mm Net Weight per Piece 15g Thread Type Single thread / Male thread Thread Specification M28.5*0.6 Material 6061T Aluminum Alloy Surface Treatment CNC / Black Anodized Substrate Thickness 1.85mm Clear Aperture 26mm Center Wavelength 500.7nm & 656.3nm & 671.6nm Half-Width 5nm Peak Transmission Rate T ≥ 90% Cut-off Wavelength 300-1000nm Cut-off Depth Average ≥ OD5 Surface Quality 60/40 Surface Parallelism λ/2
SVBONY SV227 1.25" Narrow-Band Filter is specifically designed for use with monochrome cameras in astrophotography; it effectively isolates the emission lines of certain celestial objects; enhancing image detail and contrast to make features more pronounced
SV227 1.25'' SII; H-Alpha; and OIII filters are narrowband filters commonly used in astrophotography and observations to capture specific emission lines from celestial objects
SV227 1.25" SHO Filter Kit are made with advanced glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength; or CWL
SV227 SHO filter set are used for deep sky photographic; 90% transmission of the filters can block the light pollution of the city; means the filter also blocks the light from mercury and sodium vapour lamps
In astrophotography and observation; using a combination of SV227 SII and H-Alpha and OIII narrowband filters can provide a comprehensive and visually appealing representation of celestial objects
