Elevate Your Astrophotography with Antlia Filters SII 2.5nm Ultra

Unlock the universe's brilliance with the Antlia SHO 2.5nm Ultra series filters, meticulously crafted from quartz glass and precision-coated to deliver unrivaled performance. Designed with a razor-thin FWHM (full width half maximum) of 2.5nm +0.3/-0.1nm and an exceptional transmission efficiency exceeding 93-95% at the Central Wavelength, these filters redefine deep sky imaging.

Quartz Glass Durability Our quartz glass filters boast an ultra-low thermal expansion coefficient, paired with remarkable thermal and mechanical properties. Coupled with advanced coating processes, they stand strong in the most challenging environmental conditions, making them ideal for cutting-edge imaging and research.

Enhanced Transmittance Compared to our 3nm Pro series, the 2.5nm Ultra series, coated on quartz glass, achieves even higher transmittance, with Ha/SII≥95% and OIII≥93%. Expect a significant 20-30% signal improvement in your images. The narrow FWHM of 2.5nm+0.3/-0.1nm elevates your Signal to Noise Ratio, perfect for capturing the depths of the cosmos in astounding detail.

Key Features:

High transmittance (Ha/SII≥95%, OIII≥93%) and narrow FWHM 2.5nm +0.3/-0.1nm for maximum contrast.
Flat-top spectrum minimizes transmission loss due to Center Wavelength (CWL)-shift.
OD5 (0.001%) out of band blocking to eliminate interference and minimize 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 for stray light elimination.
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 to new heights with the Antlia Filters SII 2.5nm Ultra series. Capture the cosmos with unrivaled precision and clarity.

Specifications

FWHM (Full Width Half Maximum): 2.5nm +0.3/-0.1nm
CWL (Central Wavelength): 656.3nm (H-alpha), 672.4nm (Sulfur-II), 500.7nm (Oxygen III)
Peak Transmission: 95% for H-alpha and Sulfur-II, 93% 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 to minimize vignetting and maximize clear aperture
Durable Finish: Black anodized finish for longevity
Laser Engraving: Engraved markings for easy identification without fading

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Antlia Filters SII 2.5nm Ultra

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