Enhance Your Astrophotography with Antlia Filters SII 2.8nm Ultra

Explore the cosmos like never before with the Antlia SHO 2.8nm Ultra series filters, meticulously crafted from quartz glass and precision-coated for unparalleled performance. With a slender FWHM (full width half maximum) of 2.8nm +0.5/-0.1nm and an outstanding transmission efficiency exceeding 95-97% at the Central Wavelength, these filters redefine the art of deep sky imaging.

Quartz Glass Durability Our quartz glass filters possess an ultra-low thermal expansion coefficient, coupled with exceptional thermal and mechanical properties. Paired with advanced coating processes, they exhibit exceptional durability, making them ideal for imaging and research in the most challenging environmental conditions.

Enhanced Transmittance Compared to our 3nm Pro series, the 2.8nm Ultra series, coated on quartz glass, achieves even higher transmittance, with Ha/SII≥97% and OIII≥95%. Experience a remarkable 20-30% signal improvement in your images. The narrow FWHM of 2.8nm+0.5/-0.1nm elevates your Signal to Noise Ratio, ideal for capturing the universe's wonders with stunning clarity.

Key Features:

High transmittance (Ha/SII≥97%, OIII≥95%) and narrow FWHM of 2.8nm +0.5/-0.1nm for maximum contrast.
Flat-top spectrum minimizes transmission loss due to the Center Wavelength (CWL)-shift.
OD5 (0.001%) out of band blocking eliminates interference from other wavelengths and minimizes halos around bright stars.
Quartz glass construction for superior durability, thermal stability, fracture resistance, scratch resistance, and enhanced coating resilience.
Identical filter thickness to existing standards with double-sided fine polishing and utmost care for parfocality.
Recommended for optics with a Focus Ratio of ≥ f/3.5 for peak optical performance.
Rigorous individual scanning ensures actual, measured spectra and transmission for every filter.
Edge-to-edge coating and edge blackening eliminate internal reflections from stray light.
Enjoy peace of mind with a 3-year warranty against delamination.

Please Note:

Not recommended for solar imaging or night visual observation.
DO NOT LOOK AT THE SUN WITH THIS FILTER; serious eye damage may result.

Elevate your astrophotography with the Antlia Filters SII 2.8nm Ultra series and capture the wonders of the universe with unprecedented clarity and precision.

Specifications

FWHM (Full Width Half Maximum): 2.8nm +0.5/-0.1nm
CWL (Central Wavelength): 656.3nm (H-alpha), 672.4nm (Sulfur-II), 500.7nm (Oxygen III)
Peak Transmission: 97% for H-alpha and Sulfur-II, 95% for Oxygen III
Blocking: ≥OD5 (Optical Density 5)
Filter Thickness: 2mm+/-0.05mm
Filter Ring Options: Available in 1.25’’ (M28.50.6) and 2’’(M480.75) Antlia standard ring sizes
Optimized Design: Ultra-thin filter cell minimizes vignetting and maximizes clear aperture
Durable Finish: Features a black anodized finish for longevity
Laser Engraving: Engraved markings ensure easy identification without fading.

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Antlia Filters SII 2.8nm Ultra

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