Antlia OIII 3 nm Pro 50 mm unmounted narrowband filter

Antlia OIII 3 nm Pro 50 mm Unmounted Narrowband Astrophotography Filter

The Antlia OIII 3 nm Pro 50 mm Unmounted Narrowband Astrophotography Filter is expertly engineered for professional astrophotography enthusiasts. This filter is designed to transmit light at the precise wavelength of 500.7 nm, which is emitted by ionized oxygen atoms. It is particularly effective for capturing stunning images of emission nebulae, making it an indispensable tool for astrophotographers aiming for high-quality results.

Crafted with Antlia's hallmark precision, the OIII 3 nm Pro filter has been subjected to rigorous surface quality testing that meets strict military standards, ensuring unparalleled performance. With an exceptionally narrow half-bandwidth of just 3 nm, this filter effectively blocks unwanted light from sodium and mercury lamps while maintaining high transmission for the OIII spectral line, which is critical for precise astrophotography.

Important Note: This OIII filter is not intended for visual observations and should never be used for solar viewing purposes.

Key Features of the Antlia OIII 3 nm Pro 50 mm Filter:

• Precision Bandpass: Designed for maximum transmission at a wavelength of 500.7 nm.
• Compatibility: Works with astrographs with light intensity up to f/3, such as RASA or Hyperstar.
• Narrow Bandwidth: Exceptionally narrow half-width (FWHM = 3 nm) ensures maximum contrast.
• Light Pollution Reduction: Equivalent optical density OD5 effectively filters out light pollution by up to 99.999%.

Technical Specifications:

• Filter Type: Bandpass filter.
• Filter Diameter: 50 mm.
• Filter Thickness: 3 ± 0.05 mm.
• Filter Shape: Round.
• Transmitted Bands: OIII (500.7 nm).
• Center Wavelength (CWL): 500.7 nm.
• Half Bandwidth (FWHM): 3 nm.
• Maximum Transmission: >85%.
• Blocked Bands: Mercury lamps (435.8 nm, 546.1 nm, 577 nm, 578.1 nm), Sodium lamps (598 nm, 589.6 nm, 615.4 nm, 616.1 nm).
• Light Pollution Blocking Efficiency: >99.999%.
• Equivalent Optical Density for Blocked Lines: OD5 (300 - 1000 nm).
• Surface Quality Index (according to MIL-O-13830 standard): 60/40.
• Parallelism: 30".
• Execution Accuracy (RMS): λ/4.

Included in the Set:

• Antlia OIII 3 nm Pro 50 mm filter.

Guarantee:

The filter is backed by a 3-year manufacturer's warranty, covering delamination of the filter and substrate.