Antlia OIII 3 nm Pro 31 mm unmounted narrowband filter

Antlia OIII 3 nm Pro 31 mm Unmounted Narrowband Astrophotography Filter

The Antlia OIII 3 nm Pro 31 mm Filter is an exceptional tool crafted specifically for astrophotography enthusiasts. This advanced filter is optimized for capturing stunning images of emission nebulae by efficiently transmitting light at a wavelength of 500.7 nm, which is emitted by ionized oxygen atoms. This selective transmission is crucial for revealing the intricate details and structures within these celestial formations.

As with all Antlia products, this filter is manufactured with meticulous precision and quality control. It undergoes rigorous surface quality testing in accordance with stringent military standards to ensure superior performance. With an ultra-narrow bandpass of just 3 nm, the filter effectively eliminates unwanted light from sources such as sodium and mercury lamps, while allowing high transmission of the OIII spectral line. This feature makes it an invaluable asset for astrophotographers striving for optimal image quality.

Please Note: This OIII filter is designed exclusively for astrophotography and is not suitable for visual observation. It should never be used as a solar filter under any circumstances.

Key Features of the Antlia OIII 3 nm Pro 31 mm Filter:

• Bandpass Filter: Maximizes transmission for radiation at a wavelength of 500.7 nm.
• Compatibility: Ideal for use with astrographs featuring high light intensity up to f/3, such as RASA or Hyperstar systems.
• Ultra-Narrow Half-Width: With a Full Width at Half Maximum (FWHM) of only 3 nm, the filter ensures maximum contrast and detail.
• Exceptional Light Pollution Reduction: Achieves an impressive pollution reduction level of 99.999% with an equivalent optical density (OD5).

Technical Specifications:

• Filter Type: Bandpass Filter
• Filter Diameter: 31 mm
• Filter Thickness: 2 ± 0.05 mm
• Filter Shape: Round
• Transmitted Bands: OIII (500.7 nm)
• Peak Permeability Location (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: 60/40 (according to MIL-O-13830 standard)
• Parallelism: 30 arc seconds
• Execution Accuracy (RMS): λ / 4

Included in the Set:

• Antlia OIII 3 nm Pro 31 mm Filter

Warranty:

Enjoy peace of mind with the manufacturer's 3-year warranty, which covers any delamination of the filter and substrate.