Antlia S-II 2" 4,5 nm EDGE

The Antlia S-II 2" 4.5 nm EDGE filter is a top-of-the-line professional astrophotographic filter designed specifically for capturing stunning images of emission nebulae. With a half-transmittance window width (FWHM) of 4.5 nm, it excels at transmitting light with a wavelength of 671.6 nm emitted by doubly ionized sulfur atoms, a crucial element in astrophotography.

This filter offers a unique combination of features that sets it apart. It effectively eliminates unwanted components from sodium and mercury lamps while maintaining high transmittance for the S-II spectral line. The S-II line is particularly significant in astrophotography, making this filter an ideal choice for capturing the essence of emission nebulae. Additionally, the filter is constructed using a high-quality glass substrate, minimizing the risk of internal light reflections that could affect the image quality.

The Antlia S-II 2" 4.5 nm EDGE filter stands out with its steep slope of the permeability window. Unlike ordinary broadband filters, it maintains a high level of transmittance without experiencing a significant decrease due to the shift of the maximum permeability peak (CWL). This exceptional characteristic ensures that the Antlia 4.5nm EDGE filter family is compatible with telescopes of varying light intensities.

The manufacturer guarantees that these filters can be used in optical systems with a maximum light power of f/3, as confirmed by the analysis of the violet shift. However, it's important to note that the S-II filter is not recommended for visual observation or solar observation.

Key Features of the Antlia S-II 2" 4.5 nm EDGE Filter:

Band-pass filter made on a high-quality optical substrate with maximum transmission for radiation at 671.6 nm wavelength.

Compatible with astrographs with light intensities up to f/3, ensuring minimal signal loss.

Half bandwidth of transmission (FWHM) of 4.5 nm, allowing for precise filtration of desired wavelengths.

Optical density equivalent OD5, guaranteeing highly efficient removal of light pollution.

Technical Parameters:

• 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.

Included in the Set:

• Antlia S-II 2" 4.5 nm EDGE filter.

Guarantee:

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