Industry-leading FWHM of 2.8nm: This translates to highly precise isolation of the Sulphur-II emission line (656.3 nm), responsible for intricate details in nebulae.

Minimized light interference: By filtering out unwanted light, the S-II filter unveils faint gas and dust structures, showcasing the true beauty of these celestial formations.

Efficiency for Exquisite Results:

Impressive transmission of over 97% at the central wavelength: This ensures efficient capture of desired light, leading to:

Shorter exposure times: Capture data faster.

Enhanced signal-to-noise ratio: Achieve superior image quality even under challenging light pollution.

Compared to its predecessor, the 3nm Pro series, the 2.8nm Ultra series achieves a significant increase in transmission, with Ha/SII exceeding 97% and OIII surpassing 95%. This translates to a dramatic improvement in signal-to-noise ratio, allowing you to capture the faintest wisps of nebulosity with breathtaking clarity. To further enhance the image and suppress unwanted light, Antlia employs cutting-edge edge-blackening technology, minimizing the impact of stray light and internal reflections, resulting in stunningly sharp and contrasty images.

The SII line transmission peaks at a remarkable 97% within 1nm of the center bandwidth, boasting a flat-top spectral profile that minimizes transmission loss due to central wavelength (CWL) shifting. This meticulous engineering ensures you capture the full potential of the SII emission lines. For optimal results, this filter is recommended for telescopes with a focal ratio of ≥ f/3.5.

Each Antlia filter undergoes rigorous individual scanning to guarantee the highest quality standards. The included test sheets are not generic representations, but the actual measured spectra and transmission data for your specific filter, providing you with unparalleled transparency and confidence in your equipment. Additionally, the tight tolerance of the substrate ensures a maximum deviation of ± 0.05 from specifications, crucial for maintaining parfocality with other filters in your astrophotography setup.

This filter effectively cuts off unwanted ultraviolet and infrared light, eliminating the need for a separate UV/IR-cut filter, simplifying your astrophotography setup. The quartz glass substrate and enhanced coatings further enhance the filter's resistance to fractures and scratches, ensuring it can withstand the rigors of travel and frequent use.

Specifications:

Important Safety Note: Looking directly at the sun through the Antlia filter is strictly prohibited and can cause permanent eye damage.

Antlia: Experts in Astronomy Filters

Antlia Astronomy Filters are built by Deep-Sky Photography Enthusiasts for Enthusiasts of Astrophotography all around the globe. Antlia prides itself on producing a series of exceptional quality, fully multicoated narrowband, dual-band, planetary and LRGB filters for astrophotography, designed for use with a range of monochrome and colour DSLR, CMOS and CCD cameras.

Product Code: ANT-H-SII2.8