Antlia O-III 2" 4,5 nm EDGE

The Antlia O-III 2" 4.5 nm EDGE filter is a professional astrophotographic tool designed specifically for capturing emission nebulae. It has a narrow bandwidth of 4.5 nm and transmits light at a wavelength of 500.7 nm emitted by ionized oxygen atoms. This wavelength is crucial in astrophotography as it helps capture the registration of emission nebulae effectively.

What sets the Antlia O-III 2" 4.5 nm EDGE filter apart is its ability to minimize unwanted components from sodium and mercury lamps while maintaining high transmittance for the O-III spectral line. This makes it an essential tool for astrophotographers. The filter is constructed using a high-quality glass substrate that reduces the risk of internal light reflections, ensuring optimal image quality.

Unlike ordinary broadband filters, the Antlia O-III 2" 4.5 nm EDGE filter exhibits a steep slope in its transmittance window, without a significant decrease in transmittance resulting from the shift of the maximum permeability peak (CWL). This means the filter is suitable for use with telescopes of various light intensities. The manufacturer confirms that these filters can be used in optical systems with a maximum light power of f/3, as indicated by the results of the violet shift analysis.

It's important to note that the O-III filter is not recommended for visual observation or solar observation. Its primary purpose is astrophotography.

Key Features of the Antlia O-III 2" 4.5 nm EDGE Filter:

Bandpass filter with maximum transmission for radiation at a wavelength of 500.7 nm.

Compatible with astrographs with light intensities up to f/3, ensuring minimal signal loss.

Half bandwidth of transmission (FWHM) of 4.5 nm.

Optical density equivalent OD5, guaranteeing effective removal of light pollution.

Technical Parameters:

• Filter Type: Bandpass filter
• Filter Diameter: 2"
• 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
• Holder Thread: M48x0.75

Set Elements:

• Antlia O-III 2" 4.5 nm EDGE Filter

Guarantee:

The filter comes with a 3-year manufacturer's warranty, covering delamination of the filter and substrate.