Antlia OIII 3 nm Pro 1.25" Astrophotography Filter

The Antlia OIII 3 nm Pro 1.25" Astrophotography Filter is an essential tool for astrophotographers, meticulously designed to capture the specific wavelength of 500.7 nm emitted by ionized oxygen atoms. This precision is vital for capturing stunning images of emission nebulae.

Constructed with precision, this filter meets stringent military standards for surface quality, a testament to Antlia's commitment to excellence. Its ultra-narrow bandwidth of 3 nm effectively blocks unwanted light from sodium and mercury lamps, ensuring optimal transmission of the OIII spectral line. This makes it an indispensable asset for anyone passionate about astrophotography.

Note: This OIII filter is not intended for visual observation and should never be used for solar observation.

Key Features of the Antlia OIII 3 nm Pro 1.25" Filter:

• Optimized bandpass filter for 500.7 nm wavelength radiation.
• Compatible with astrographs with light intensity down to f/3, such as RASA or Hyperstar.
• Exceptionally narrow half-width of the transmitted band (FWHM = 3 nm) for maximum contrast.
• Equivalent optical density OD5, effectively reducing light pollution by 99.999%.

Technical Specifications:

• Filter Type: Bandpass Filter
• Filter Diameter: 1.25"
• Filter Thickness: 2 ± 0.05 mm
• Filter Shape: Round
• Transmitted Bands: OIII (500.7 nm)
• Maximum Permeability Peak (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 (Acc. to MIL-O-13830 Standard): 60/40
• Parallelism: 30"
• Execution Accuracy (RMS): λ / 4

Kit Components:

• Antlia OIII 3 nm Pro 1.25" Filter

Guarantee:

Enjoy peace of mind with a 3-year manufacturer's warranty, covering delamination of the filter and substrate.