Antlia O-III 36mm 4.5nm EDGE Astrophotography Filter

The Antlia O-III 36mm 4.5nm EDGE Astrophotography Filter is expertly crafted for capturing the unique light emitted by ionized oxygen atoms at a precise wavelength of 500.7 nm. With a narrow full width at half maximum (FWHM) transmission window of 4.5 nm, this filter is perfect for photographing emission nebulae with exceptional clarity.

This filter stands out with its ability to effectively block unwanted light from sodium and mercury lamps, while maintaining high transmittance for the O-III spectral line. Crafted on a superior glass substrate, it significantly reduces the risk of internal light reflections, ensuring high-quality astrophotography results.

The Antlia O-III 36mm 4.5nm EDGE features a steep transmission window slope, which means it doesn't suffer from a significant drop in transmittance due to shifts in the central wavelength (CWL). This makes it compatible with a wide range of telescopes, even those with maximum light power of f/3, as confirmed by manufacturer data.

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

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

• Designed on high-quality optical substrate, maximizing transmission at 500.7 nm wavelength.
• Compatible with astrographs with light intensities up to f/3, ensuring minimal signal loss.
• Features a narrow transmission half-bandwidth (FWHM) of 4.5 nm.
• Optical density equivalent to OD5, effectively removing 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: 60/40 (according to MIL-O-13830)
• 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.