1.25inch SHO Filters

ToupTek New Narrowband 1.25" Filtes

Specifications:

· Diameter: 1.25-inch (31.77mm)

· Thread: M28.5*0.6mm

· Lens Thickness: 2mm

· Lens Material: Optical Glass

Frame Material: Aluminum Alloy

Narrowband filters make astronomical photography more interesting. Emission nebulae contain rich and complex narrowband emission lines, such as the deep red 656.28nm Hα emission line, the red [SII] (671.6nm and 673.1nm) and the blue-green [OIII] (500.7nm and 495.9nm).

Work Showcase

H-alpha filter

hcg gain100 300s

SII filter

hcg gain100 300s

German SCHOTT Optical Glass Material

The filter is made from high-quality German SCHOTT optical glass with a diameter of 1.25 inches (31.77mm) and a thickness of 2mm. It has been polished on both sides for a smooth and even surface, ensuring excellent optical performance. The filter is suitable for astronomical observation and imaging needs, guaranteeing high-quality image reproduction.

 IAD Coating Technology

The filter employs IAD (Ion-Assisted Deposition) coating technology, which provides a dense and wear-resistant coating, greatly enhancing the filter's stability and durability. The high-strength coating ensures stable performance even after prolonged use.

 High Transmission and Anti-Reflective Coating

The filter's surface is equipped with a high-transparency anti-reflective coating, with a transmission rate of over 90%. This effectively reduces both surface and internal reflections, minimizing halo effects and ensuring clear imaging. The filter is also polished with flat optical treatment to optimize performance.Precise Wavelength Calibration

1.25-inch filters offer highly accurate wavelength calibration (tolerance of just ±0.3 nanometers), effectively filtering and enhancing specific wavelengths of light. They allow precise capture of particular emission lines or absorption spectral features of celestial bodies, ensuring accurate image reproduction and data integrity.

Good Wear Resistance and Easy to Clean

The filter’s coating design is durable and resistant to wear, making it less likely to get scratched during regular cleaning. The optimized coating stress design avoids affecting the flatness of the optical substrate, ensuring filter accuracy and extending service life.

High-Quality Aluminum Alloy Frame Widely Compatible with Electric Filter Wheels
The filter uses a high-strength aluminum alloy frame, anodized and matte-treated for strong corrosion resistance, ease of handling, and durability. It is compatible with mainstream 1.25-inch electric filter wheels on the market, allowing users to flexibly pair and improve usability.