Product Detail
SVBONY SV220 Telescope Filter, H-Alpha & OIII, 3nm Dual-Band 2 inch Nebula Filter for Astrophotography
- 3nm Dual Narrowband (H-Alpha + OIII): With an ultra-narrow FWHM bandwidth of only 3±1nm, it efficiently filters out background stray light. Combined with a wide cutoff wavelength range of 300-1050nm (covering ultraviolet to near-infrared spectra) and an average OD5 transmittance as low as 0.001%, it strongly suppresses light pollution and stray light, significantly improving the signal-to-noise ratio (SNR);
- High Transmittance of 85%+: The high transmittance performance greatly reduces exposure requirements. Even in heavily light-polluted urban environments, it enables fast capture of deep-sky objects, balancing imaging details and shooting convenience;
- Minimal Halo Coating Design: Adopting multi-layer minimal halo coating technology, it reduces glare and halo interference, enhances image contrast and color accuracy, presents sharp celestial details against a clean background, and improves the purity of deep-sky photography images;
- Full-Frame Compatible + Ultra-Wide-Angle Adaptable: The 2-inch version is specially designed for full-frame sensors, compatible with mainstream astronomical cameras. It effectively reduces vignetting in ultra-wide-angle lenses, ensuring uniform brightness from the edge to the center of the image and presenting the complete view of nebulae and galaxies;
- Standard Specifications: Features M28.5×0.6 thread and a lens barrel size of Φ31.75×7mm.
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