Elevate Your Astrophotography with Antlia Filters SII 3nm Pro

Experience the cosmos like never before with the Antlia SII Pro narrowband filter, meticulously designed to optimize the FWHM (full width half maximum) to a precise 3nm bandpass. Narrower bandwidth means enhanced contrast for emission targets by reducing unwanted background signal, making the Antlia SII 3nm Pro filter an ideal choice for astrophotographers.

Key Features:

• High Transmittance: Designed to deliver 88% transmission at the 671.6nm line, providing maximum signal and well-defined nebulae structures.
• Optimized Design: Guarantees >88% transmission within 1nm range of the center bandwidth, suitable for both long focal ratios and fast optical systems.
• Fast Optics Compatibility: Compatible with systems as fast as f/3, including Hyperstar and RASA, with minimal loss in emission signal.
• Outstanding Blocking: OD5 (0.001%) out of band blocking specification ensures an excellent SNR (signal to noise ratio) and effective cut-off rate to minimize interference from other wavelengths.
• Halo Minimization: Designed to minimize halos around bright stars for sharper images.
• Single Substrate: Utilizes a single substrate to eliminate internal reflections.
• Versatile Application: Suitable for SII Emission Nebulae, Planetary Nebulae, Wolf-Rayet Nebulae, and Supernova Remnants.
• Adaptable: Ideal for use in both light-polluted areas and dark sites, extending imaging time even under moonlight.
• Optical Reliability: Superior optical reliability reduces the need for extensive post-image processing.
• Edge Blackening: All Antlia narrowband Pro filters are edge blackened to eliminate internal reflections from stray light.

Please Note:

• Not recommended for solar observing and imaging.
• Not suitable for visual observation.
• DO NOT LOOK AT THE SUN WITH ANTLIA FILTERS; serious eye damage may result.

Our filters are meticulously designed to achieve exceptional contrast with extremely dark backgrounds while maintaining high SII signal transmission. Each filter undergoes rigorous testing to ensure quality and performance. Though these filters involve higher production costs, we believe they offer a compelling price-to-performance ratio compared to similar premium options in the market. Explore the universe with clarity and precision using Antlia Filters SII 3nm Pro.

Specifications

• Basic Substrate: Schott optical substrate
• Filter Thickness: 2mm+/-0.05mm for 1.25'' mounted
• FWHM (Full width at half maximum): 3nm
• CWL (Central Wavelength): 671.6nm
• Peak Transmission: >88%
• Blocking: > 5 OD (0.001% out of band blocking) @ 300-1000nm
• Surface Quality: S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
• Transmitted Wavefront: Lambda/4 or better
• Parallelism: Less than 30 arcsec
• **Single / Non-glued substrate
• Warranty: 3-years against delamination