Antlia SII 3 nm Pro 2 Astrophotography Narrowband Filter

Experience a new level of precision in your astrophotography with the Antlia SII 3 nm Pro 2 Filter. This professional-grade filter is engineered to isolate the light at a wavelength of 671.6 nm, emitted by double ionized sulfur atoms, making it indispensable for capturing the intricate details of emission nebulae.

Manufactured with meticulous attention to quality, the Antlia SII 3 nm Pro 2 filter undergoes rigorous testing to meet stringent military standards. Its design features an extremely narrow half-band width of just 3 nm, effectively blocking unwanted light from sodium and mercury lamps, while ensuring high transmission of the SII spectral line that is crucial for stunning astrophotographs.

Note: This filter is not suitable for visual observation and must never be used as a solar filter.

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

• High-Quality Schott Substrate: Built on a premium Schott substrate, this filter maximizes transmission at 671.6 nm.
• Astrograph Compatibility: Optimized for use with astrographs capable of f/3 light intensity, such as RASA or Hyperstar, ensuring versatility and superior performance.
• Exceptionally Narrow Half-Width: With a Full Width at Half Maximum (FWHM) of only 3 nm, it provides outstanding contrast for detailed astrophotography.
• Optical Density OD5: Achieves an equivalent optical density of OD5, effectively blocking light pollution with an efficiency 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 is backed by a 3-year manufacturer's warranty, covering filter delamination and substrate defects, ensuring your investment is protected and providing peace of mind.