Antlia SII 3 nm Pro 2" narrowband filter

The Antlia SII 3 nm Pro 2 filter is designed specifically for professional astrophotography, allowing the transmission of light with a wavelength of 671.6 nm emitted by double ionized sulfur atoms. This filter plays a crucial role in capturing the beauty of emission nebulae, making it an essential tool for astrophotographers.

Crafted with utmost precision and care, the Antlia SII 3 nm Pro 2 filter has undergone rigorous surface quality tests that comply with stringent military standards. Its exceptional construction ensures optimal performance and reliability. Notably, the filter boasts an impressively narrow half-band width of only 3 nm. This characteristic enables the near-complete elimination of undesirable components emitted by sodium and mercury lamps while delivering high transmission capabilities for the spectral line SII, which holds great significance in the field of astrophotography.

It is important to note that the SII filter is not recommended for visual observation, and it should never be used as a solar filter under any circumstances.

Key Features of the Antlia SII 3 nm Pro 2 Filter:

Bandpass Filter on High-Quality Schott Substrate: The filter is meticulously constructed on a premium Schott substrate, maximizing the transmission of radiation with a wavelength of 671.6 nm.

Compatibility with Astrographs: The filter is compatible with astrographs capable of handling intense light, such as those with an f/3 light intensity (e.g., RASA or Hyperstar), ensuring optimal performance and flexibility.

Exceptionally Narrow Half-Width: With a Full Width at Half Maximum (FWHM) of only 3 nm, the filter provides an extremely narrow band of transmitted light, resulting in maximum contrast for capturing detailed astrophotographs.

Equivalent Optical Density OD5: The filter achieves an equivalent optical density of OD5, guaranteeing the efficient removal of light pollution at a remarkable level of 99.999%.

Technical Specifications:

• Filter Type: Bandpass Filter
• Filter Diameter: 2"
• Filter Thickness: 2 ± 0.05 mm
• Filter Shape: Round
• Transmitted Bands: SII (671.6 nm)
• Peak Transmittance (CWL) Location: 671.6 nm
• Half Bandwidth (FWHM): 3 nm
• Maximum Transmission: >88%
• Blocked 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)
• Light Pollution Blocking Efficiency: >99.999%
• Equivalent Optical Density for Blocked Lines: OD5 (300 - 1000 nm)
• Surface Quality Index (according to MIL-O-13830 standard): 60/40
• Parallelism: 30"
• Execution Accuracy (RMS): λ / 4

Included in the Set:

• Antlia SII 3 nm Pro 2 Filter

Warranty:

The Antlia SII 3 nm Pro 2 Filter comes with a 3-year manufacturer's warranty that covers filter delamination and substrate defects, ensuring your peace of mind and confidence in the product's quality.