Antlia O-III 50 mm 4.5 nm EDGE Astrophotography Filter

The Antlia O-III 50 mm 4.5 nm EDGE is a premium astrophotography filter specifically engineered for capturing the exquisite details of emission nebulae. With its narrowband design, this filter selectively captures light at the 500.7 nm wavelength, emitted by ionized oxygen atoms, making it an essential tool for professional astrophotographers aiming for stunning celestial images.

Key Features

• Precision Bandpass Filter: Crafted on a high-quality optical substrate to maximize transmission at 500.7 nm.
• Compatibility: Suitable for astrographs with light intensity up to f/3, ensuring minimal signal loss.
• Narrow Bandwidth: Features a half bandwidth transmission (FWHM) of 4.5 nm for precise filtering.
• Light Pollution Reduction: Optical density equivalent OD5 for effective elimination of light pollution from sodium and mercury lamps.
• Image Quality: Designed to minimize internal reflections, providing clearer, higher quality images.

Technical Specifications

• Filter Type: Bandpass Filter
• Filter Diameter: 50 mm
• Filter Thickness: 3 ± 0.05 mm
• Filter Shape: Round
• Pass Bands: O-III (500.7 nm)
• Maximum Transmittance Peak (CWL): 500.7 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: 60/40 (According to MIL-O-13830)
• Parallelism: 30"
• Manufacturing Accuracy (RMS): λ/4

Set Elements

• Antlia O-III 50 mm 4.5 nm EDGE Filter

Warranty

The Antlia O-III 50 mm 4.5 nm EDGE filter is backed by a 3-year manufacturer's warranty, covering delamination of the filter and substrate.

Note: This filter is not recommended for visual observation or solar observation.