ToupTek SII 36mm 4NM FWHM Narrowband Filter Astronomical Filter for Deepsky Photography

Description:
- Narrowband filters are essential accessories in astrophotography, used to isolate specific wavelength emission lines and enhance target signal-to-noise ratio - particularly suitable for capturing spectacular emission nebulae.
- SHO narrowband filters are precisely tuned to the three primary ionized emission lines of star-forming regions: Hα (656.3nm); SII (671.6nm); OIII (500.7nm)
- By using these filters, you can effectively block urban light pollution and background stray light, significantly enhancing signal contrast and revealing incredible detail - enabling you to achieve Hubble-like palettes (SHO composites) in your astrophotography. 

Technical Parameters:
- Size: 36mm
- Glass thickness: 2mm
- Transmittance: >90%
- Glass material: Quartz Glass
- Frame material: aluminum alloy
- OD value: ≥5.0

Package Included:
- 1 x SII Filter