Antlia S-II 2" 4,5 nm EDGE

Antlia S-II 2" 4.5 nm EDGE Astrophotographic Filter

Elevate your astrophotography with the Antlia S-II 2" 4.5 nm EDGE Astrophotographic Filter, a professional-grade filter meticulously engineered for capturing breathtaking images of emission nebulae.

Product Highlights:

• Exceptional Narrowband Performance: Features a Full Width at Half Maximum (FWHM) of 4.5 nm, precisely tuned to transmit light at the 671.6 nm wavelength emitted by doubly ionized sulfur atoms.
• Superior Light Pollution Rejection: Effectively blocks unwanted light from sodium and mercury lamps, ensuring high transmittance for the S-II spectral line, crucial for astrophotography.
• High-Quality Construction: Built with a premium optical glass substrate that minimizes internal reflections, preserving image clarity and quality.
• Wide Compatibility: Designed for use with telescopes of various light intensities, maintaining peak performance even at f/3 light power.

While this filter is a superb choice for astrophotography, it is not recommended for visual or solar observation.

Key Features:

• Optimal band-pass filter on a high-grade optical substrate.
• Compatible with astrographs with light intensities up to f/3, ensuring minimal signal loss.
• Precisely filters desired wavelengths with a 4.5 nm half bandwidth of transmission.
• Optical density equivalent to OD5 for highly effective light pollution reduction.

Technical Specifications:

• Filter type: Bandpass filter.
• Filter diameter: 2".
• Filter thickness: 2 ± 0.05 mm.
• Filter shape: Round.
• Pass bands: S-II (671.6 nm).
• Location of the peak of transmittance (CWL): 671.6 nm.
• Half bandwidth (FWHM): 4.5 nm.
• Maximum transmission: >90% ± 1 nm from the maximum transmission peak.
• Blocked light pollution bands: Mercury lamps (435.8 nm, 546.1 nm, 577 nm, 578.1 nm), sodium lamps (598 nm, 589.6 nm, 615.4 nm, 616.1 nm).
• Optical density equivalent for blocked lines: OD5 (300 - 1000 nm).
• Surface quality index (according to MIL-O-13830): 60/40.
• Parallelism: 30".
• Manufacturing accuracy (RMS): λ/4.
• Holder thread: M48x0.75.

What's Included:

• Antlia S-II 2" 4.5 nm EDGE filter

Warranty:

The Antlia S-II 2" 4.5 nm EDGE filter is backed by a 3-year manufacturer's warranty against delamination of the filter and substrate. This warranty ensures your peace of mind and secures your investment in quality astrophotography equipment.