Antlia SII 3 nm Pro 1,25" narrowband filter

Antlia SII 3 nm Pro 1.25" Narrowband Astrophotography Filter

Explore the cosmos with the Antlia SII 3 nm Pro 1.25" Narrowband Astrophotography Filter, meticulously designed for dedicated astrophotographers. This specialized filter is crafted to transmit light at a precise wavelength of 671.6 nm, emitted by double-ionized sulfur atoms, making it ideal for capturing stunning images of emission nebulae.

Engineered with precision and quality, the Antlia SII filter meets the highest standards, undergoing rigorous surface quality testing to ensure reliability and performance. With an exceptionally narrow half-band width of just 3 nm, it effectively eliminates unwanted light from sodium and mercury lamps while maintaining a high transmission rate for the SII spectral line, crucial for astrophotography enthusiasts.

Note: This SII filter is not suitable for visual observation and should never be used for solar observation.

Key Features

• Constructed on a premium-grade Schott substrate, maximizing transmission at 671.6 nm.
• Compatible with astrographs featuring light intensity up to f/3, such as RASA or Hyperstar.
• Ultra-narrow transmitted band half-width (FWHM = 3 nm) for unparalleled contrast.
• Optical density equivalent to OD5, achieving 99.999% efficiency in blocking light pollution.

Technical Specifications

• Filter Type: Bandpass Filter
• Filter Diameter: 1.25"
• Filter Thickness: 2 ± 0.05 mm
• Filter Shape: Round
• Transmitted Bands: SII (671.6 nm)
• Peak Transmittance (CWL): 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 (per MIL-O-13830 standard): 60/40
• Parallelism: 30 arcseconds
• Execution Accuracy (RMS): λ / 4

Kit Components

The package includes:

• Antlia SII Filter 3 nm Pro 1.25"

Warranty

The manufacturer provides a 3-year warranty, covering any delamination of the filter and substrate.

This description provides a clean, structured format that highlights the key features and technical specifications of the Antlia SII 3 nm Pro 1.25" Narrowband Astrophotography Filter to assist customers in making an informed purchasing decision.