Antlia S-II 50 mm 4,5 nm EDGE

Antlia S-II 50 mm 4.5 nm EDGE Astrophotography Filter

The Antlia S-II 50 mm 4.5 nm EDGE is a cutting-edge astrophotography filter meticulously crafted for professional photographers who demand the highest image quality. With its precise 4.5 nm full-width at half maximum (FWHM) transmission window, this filter is engineered to transmit light at the critical wavelength of 671.6 nm, emitted by doubly ionized sulfur atoms. This specific range is essential for capturing breathtaking images of emission nebulae.

One of the standout features of this filter is its exceptional ability to block unwanted light from sodium and mercury lamps while maintaining superior transmittance for the S-II spectral line. This capability is particularly important in astrophotography, where capturing fine details is crucial. The filter is built with a premium glass substrate to minimize internal light reflections, ensuring that your images are clear and sharp.

What differentiates the Antlia S-II 50 mm 4.5 nm EDGE filter from traditional broadband filters is the steep slope of its permeability window. Unlike ordinary filters, the Antlia filter maintains its high transmittance without experiencing significant decreases due to shifts in the central wavelength (CWL). This unique feature makes the Antlia 4.5 nm EDGE filters adaptable to telescopes with varying light intensities, and it has been rigorously tested to perform flawlessly with optical systems having a maximum light power of f/3.

Please note, this S-II filter is designed specifically for astrophotography and is not recommended for visual or solar observation.

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

• Constructed on a high-quality optical substrate for maximum transmission at 671.6 nm wavelength.
• Compatible with astrographs with light intensities up to f/3, ensuring minimal signal loss.
• Features a 4.5 nm half bandwidth (FWHM) for precise wavelength isolation.
• Optical density rated at OD5, effectively removing 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: 60/40 (according to MIL-O-13830)
• 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 comes with a 3-year manufacturer's warranty, providing protection against delamination of the filter and substrate.