Antlia S-II 50 mm 4,5 nm EDGE

The Antlia S-II 50 mm 4.5 nm EDGE is an advanced astrophotography filter designed for professionals seeking optimal image quality. With a half-width transmission window (FWHM) of 4.5 nm, this filter effectively transmits light at a wavelength of 671.6 nm emitted by doubly ionized sulfur atoms. This specific range is crucial when capturing stunning images of emission nebulae.

The key feature of this filter lies in its ability to eliminate unwanted components emitted by sodium and mercury lamps while maintaining high transmittance for the S-II spectral line. This spectral line is particularly significant in astrophotography, making the Antlia S-II 50 mm 4.5 nm EDGE filter a valuable tool for capturing intricate details. Manufactured with a high-quality glass substrate, the filter minimizes the risk of internal light reflections, ensuring clear and crisp images.

What sets the Antlia S-II 50 mm 4.5 nm EDGE filter apart from conventional broadband filters is its steep slope of the permeability window. Unlike ordinary filters, it does not experience a significant decrease in transmittance caused by the shift of the maximum permeability peak (CWL). This unique characteristic allows the Antlia 4.5 nm EDGE family of filters to seamlessly adapt to telescopes with varying light intensities. According to the manufacturer, the filter has undergone violet shift analyses and is confirmed to work flawlessly with optical systems featuring a maximum light power of f/3.

It is important to note that the S-II filter is not recommended for visual observation or solar observation purposes due to its specialized nature.

Highlights of the Antlia S-II 50mm 4.5nm EDGE Filter:

Band-pass filter constructed on a high-quality optical substrate, maximizing transmission for radiation at 671.6 nm wavelength.

Compatible with astrographs with light intensity up to f/3, ensuring minimal signal loss during astrophotography.

Half bandwidth of transmission (FWHM) measures 4.5 nm, allowing precise isolation of desired wavelengths.

Optical density equivalent to OD5 guarantees highly efficient removal of light pollution.

Technical Parameters:

• Filter type: Bandpass filter
• Filter diameter: 50 mm
• Filter thickness: 3 ± 0.05 mm
• Filter shape: Round
• Pass bands: S-II (671.6 nm)
• Peak 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

Set Elements:

• Antlia S-II 50 mm 4.5 nm EDGE filter

Guarantee:

The Antlia S-II 50 mm 4.5 nm EDGE filter is backed by a 3-year manufacturer's warranty, ensuring protection against delamination of the filter and substrate.