Antlia S-II 36 mm 4,5 nm EDGE

If you're a professional astrophotographer seeking to capture the intricate beauty of emission nebulae, the Antlia S-II 36 mm 4.5 nm EDGE filter is your ideal companion. Designed with precision, this filter boasts a remarkable half-width transmission window (FWHM) of 4.5 nm, enabling the transmission of light at a specific wavelength of 671.6 nm emitted by doubly ionized sulfur atoms. This particular wavelength is of paramount importance when photographing emission nebulae.

One of the standout features of this filter is its ability to effectively eliminate unwanted light from sources such as sodium and mercury lamps, while still providing a high level of transmittance for the S-II spectral line. This spectral line is crucial in the realm of astrophotography, making the Antlia S-II filter an essential tool for capturing stunning celestial images. Crafted on a high-quality glass substrate, this filter minimizes the risk of internal light reflections, ensuring the utmost clarity in your astrophotographic endeavors.

What sets the Antlia S-II 36 mm 4.5 nm EDGE filter apart from conventional broadband filters is its steep permeability window slope. Unlike standard filters, it does not exhibit a significant decrease in transmittance due to a shift in the maximum permeability peak (CWL). This remarkable attribute ensures that filters from the Antlia 4.5 nm EDGE family can seamlessly integrate with telescopes offering a wide range of light intensities. As per the manufacturer's specifications, these filters have been subjected to violet shift analyses, confirming their suitability for optical systems with a maximum light power of f/3.

It's important to note that the Antlia S-II filter is not recommended for visual observation or solar observation.

Key Highlights of the Antlia S-II 36mm 4.5nm EDGE Filter:

• Precision-crafted band-pass filter on a high-quality optical substrate, optimized for radiation with a wavelength of 671.6 nm.
• Compatibility with astrographs featuring light intensity up to f/3, ensuring minimal signal loss.
• Impressive half bandwidth of transmission (FWHM) at 4.5 nm.
• Equipped with an optical density equivalent (OD5) for efficient light pollution removal.

Technical Specifications:

Filter Type: Bandpass Filter

Filter Diameter: 36 mm

Filter Thickness: 2 ± 0.05 mm

Filter Shape: Round

Pass Bands: S-II (671.6 nm)

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 (MIL-O-13830): 60/40

Parallelism: 30"

Manufacturing Accuracy (RMS): λ/4

Included in the Set:

• Antlia S-II 36mm 4.5nm EDGE Filter

Rest assured, the Antlia S-II 36 mm 4.5 nm EDGE filter comes with a 3-year manufacturer's warranty, covering delamination of the filter and substrate. Elevate your astrophotography game with this outstanding filter and capture the wonders of the cosmos in unparalleled detail.