Antlia O-III 2" 4,5 nm EDGE

Antlia O-III 2" 4.5 nm EDGE Astrophotography Filter

The Antlia O-III 2" 4.5 nm EDGE filter is a premier astrophotographic accessory designed for capturing the vivid details of emission nebulae. With its precise narrow bandwidth of 4.5 nm, it effectively transmits light at the critical wavelength of 500.7 nm, emitted by ionized oxygen atoms. This makes it an invaluable tool for astrophotographers aiming to document the beauty of the cosmos.

What distinguishes the Antlia O-III 2" 4.5 nm EDGE filter is its exceptional ability to filter out unwanted light from sodium and mercury lamps, ensuring high transmittance of the O-III spectral line. Constructed from high-quality glass, this filter minimizes internal reflections, thereby enhancing image clarity and quality.

Unlike standard broadband filters, the Antlia O-III 2" 4.5 nm EDGE filter features a steep transmittance window slope, maintaining transmittance without a significant decrease due to the shift of the maximum permeability peak (CWL). This makes it compatible with a range of telescope light intensities, particularly those with a maximum light power of f/3, as confirmed through violet shift analysis.

Please note: This filter is specifically designed for astrophotography and is not recommended for visual or solar observations.

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

• Bandpass filter optimized for 500.7 nm radiation.
• Compatible with astrographs of up to f/3 light intensity, minimizing signal loss.
• 4.5 nm Half Bandwidth of Transmission (FWHM).
• Optical density equivalent OD5 for effective light pollution reduction.

Technical Specifications:

• 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

Included in the Set:

• Antlia O-III 2" 4.5 nm EDGE Filter

Warranty:

The filter is backed by a 3-year manufacturer's warranty, which covers delamination of the filter and its substrate.