ToupTek H-alpha 2-inch 4NM FWHM Narrowband Filter Astronomical Filter for Deepsky Photography

Description:
- Ultra-narrow precision isolation for superior signal-to-noise ratio and exceptional Hubble Palette nebula details.
- Narrowband filters are essential for astrophotography. Astronomy SHO filter targets the three key ionized emission lines in stellar nurseries: SII (671.6nm); Hα (656.3nm); OIII (500.7nm)
- With a narrower 4nm FWHM bandpass, it precisely transmits the target light while providing stronger suppression of urban light pollution and background gradients. This also reduces band overlap, resulting in higher signal-to-noise ratio, improved contrast, and more distinct detail. It is well-suited for creating images in the Hubble Palette.

Technical Parameters:
- Size: 2-inch
- Glass thickness: 2mm
- Transmittance: >90%
- FWHM: 4nm (all channels)
- Glass material: Quartz Glass
- Frame material: aluminum alloy
- OD value: ≥5.0
- Coating technology: IAD (Ion Assisted Deposition)

Package Included:
- 1 x H-alpha Filter