Antlia Filters H-Alpha 4.5nm Edge: Enhanced Narrowband Imaging for Astrophotography

The Antlia H-alpha 4.5nm Edge narrowband filter is a cutting-edge tool designed for astrophotographers seeking to capture the faintest H-alpha nebulae structures with exceptional clarity. By fine-tuning the Full Width Half Maximum (FWHM) to a 4.5nm bandpass, it significantly improves the Signal to Noise Ratio (SNR) and contrast in images. This filter incorporates the high transmittance and strong optical density (OD) suppression features of the Antlia 3nm Pro series, delivering over 90% transmittance within a 1nm range of its central bandwidth. This ensures maximum signal capture at the crucial 656.3nm line, making it ideal for both long focal ratios and fast optical systems, including those as fast as f/3.

Key Features:

• Optimized Bandpass: 4.5nm FWHM for enhanced contrast in H-alpha nebulae imaging.
• High Transmittance: Over 90% within a 1nm range of the 656.3nm line.
• Superior SNR: OD5 suppression on unwanted wavelengths enhances signal clarity.
• Fast Optics Compatibility: Suitable for systems as fast as f/3, ensuring minimal signal loss.
• Quality Assurance: Each filter individually tested and scanned for high-performance standards.
• Affordable Quality: Exceptional quality and performance at a competitive price, offering favorable price-to-performance ratio.

Safety and Usage Guidelines:

• Not for Solar Observation: Not recommended for solar imaging or visual observation.
• Warning: Direct solar observation with this filter can cause serious eye damage.

The Antlia H-alpha 4.5nm Edge narrowband filter is an indispensable asset for astrophotographers, ensuring that every celestial capture is imbued with extraordinary detail and contrast. This filter exemplifies Antlia's commitment to quality, performance, and affordability in the field of astronomical imaging.

Specifications

• Substrate: Optical quality, single, non-glued.
• Filter Thickness: 2mm ±0.05mm, ideal for 1.25” mounts.
• FWHM: Narrow 4.5nm for precise light filtration.
• Central Wavelength: Focused at 656.3nm for H-alpha line.
• Peak Transmission: Over 90%, ensuring bright captures.
• Blocking Efficiency: Greater than 5 OD at 300-1000nm wavelengths.
• Surface Quality: 60/40 scratch/dig ratio as per MIL-O-13830.
• Wavefront Accuracy: Lambda/4 or higher.
• Parallelism: Maintained under 30 arcsec for consistency.