Antlia OIII 3 nm Pro 1,25" narrowband filter

The Antlia OIII 3 nm Pro 1.25" filter is a specialized astrophotography tool designed to capture light at a precise wavelength of 500.7 nm emitted by ionized oxygen atoms. This capability is crucial when photographing emission nebulae.

Crafted with meticulous care, this filter adheres to the strictest military standards for surface quality testing, a hallmark of all Antlia products. Notably, its ultra-narrow half-band width of only 3 nm effectively eliminates unwanted components from sodium and mercury lamps while ensuring high transmission for the OIII spectral line. This makes it an invaluable asset for astrophotography enthusiasts.

Please be aware that the OIII filter is not suitable for visual observations and should never be used for solar observations.

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

• Bandpass filter optimized 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.