Antlia O-III 36 mm 4,5 nm EDGE

The Antlia O-III 36mm 4.5nm EDGE is a professional astrophotography filter designed for capturing the specific light emitted by ionized oxygen atoms at a wavelength of 500.7 nm. This filter boasts a narrow half-width transmission window (FWHM) of 4.5 nm, making it ideal for photographing emission nebulae.

What sets the Antlia O-III 36mm 4.5nm EDGE apart is its ability to effectively block unwanted light from sodium and mercury lamps while maintaining high transmittance for the O-III spectral line—a crucial feature for astrophotographers. Crafted on a top-quality glass substrate, it minimizes the risk of internal light reflections.

Notably, the Antlia O-III 36mm 4.5nm EDGE filter exhibits a steep transmission window slope. Unlike conventional broadband filters, it doesn't experience a significant drop in transmittance due to the shift in the maximum permeability peak (CWL). This ensures compatibility with telescopes across a wide range of light intensities, with manufacturer data confirming its successful use in optical systems with a maximum light power of f/3.

Please note that this filter is not recommended for visual observation or solar observation.

Key Features of the Antlia O-III 36mm 4.5nm EDGE Filter:

• Bandpass filter crafted on high-quality optical substrate with maximum transmission at 500.7 nm wavelength.
• Compatible with astrographs having light intensities up to f/3 with minimal signal loss.
• Narrow half-bandwidth of transmission (FWHM) at 4.5 nm.
• Optical density equivalent to OD5, ensuring efficient removal of light pollution.

Technical Specifications:

Filter Type: Bandpass Filter

Filter Diameter: 36 mm

Filter Thickness: 2 ± 0.05 mm

Filter Shape: Round

Pass Bands: O-III (500.7 nm)

Location of Maximum Transmittance Peak (CWL): 500.7 nm

Half Bandwidth (FWHM): 4.5 nm

Maximum Transmission: >85% ± 1 nm from the maximum transmission peak

Blocked Light Pollution 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)

Optical Density Equivalent for Blocked Lines: OD5 (300 - 1000 nm)

Surface Quality Index (according to MIL-O-13830): 60/40

Parallelism: 30"

Manufacturing Accuracy (RMS): λ/4

Included in the Set:

• Antlia O-III 36mm 4.5nm EDGE Filter

Warranty:

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