Herschel Antlia CaK 3nm prism

Antlia Solar Herschel Wedge

The Antlia Solar Herschel Wedge is a 35mm solar prism replacing the standard diagonal mirror at the back of refracting telescopes. Designed for high-resolution imaging of the Sun, it offers sharper, higher-contrast images of solar granulation, sunspots and other fine details. The system incorporates an ultra-narrow 3nm CaK filter centered at 393.3nm, perfect for capturing visible structures in the Calcium II K band.

Key features

• 35mm prism designed on the Herschel Wedge principle
• Integrated CaK 3nm filter, centered at 393.3nm
• CNC construction in aeronautical aluminum
• Secure, reduced transmission of sunlight
• Brightness control via adjustable ring with integrated diaphragm
• Thick polycrystalline ceramic diffuser for heat dissipation
• Efficient ventilation above the ceramic plate for cooling
• Multi-coated anti-reflective optics to reduce internal reflections
• Integration of a solar finder for safe alignment

Built-in CaK 3nm filter specifications

• Ultra-narrow 3nm bandwidth
• Center wavelength: 393.3nm (Calcium K-Line)
• High blocking :
  • OD5 (0.001%) between 200nm and 1200nm
  • OD3 (0.1%) between 1200nm and 1500nm
• Polished, heat-resistant double-sided substrate
• Designed to maximize the contrast of sunspots, granulation and other fine details

Ideal applications

• Imaging solar granulation
• High-resolution sunspot capture
• Calcium II K-band solar surface imaging

Recommendations for use

• For use exclusively with refracting telescopes
• Maximum recommended aperture: 120mm
• Recommended focal length: F/5.5 ratio or better
• Photographic use only, not suitable for visual observation
• Never use without the CaK filter supplied

Safety precautions

• DO NOT use for direct visual observation.
• DO NOT use without filter to avoid irreversible damage to eyes and equipment.
• Device designed for secure solar imaging only.

Warranty and support

• 1-year manufacturer's warranty
• The warranty is void if the prism is disassembled.
• No returns, exchanges or repairs accepted after opening