Antlia CaK 3 nm solar filter 1,25"

The Antlia CaK 3 nm 1.25" filter is a specialized bandpass filter designed for capturing radiation emitted by ionized calcium atoms. This filter enables the acquisition of highly detailed images of various solar phenomena, such as sunspots and surface granulation, among others.

To create this filter, a multi-layer coating was applied to a double-polished substrate made from optical glass with high-temperature resistance. This construction ensures optimal performance for the Ca-K spectral line at 393 nm, with an impressively narrow half-width of just 3 nm. Consequently, images obtained using the Antlia CaK 3 nm 1.25" filter exhibit exceptional optical efficiency within its transmission band, while effectively blocking other spectral components, achieving optical densities at OD3 and OD5 levels.

Please note that the Antlia CaK 3 nm 1.25" filter is specifically designed for use with ultra-sensitive astronomical cameras and is not suitable for visual observations.

Key Features of the Antlia CaK 3 nm 1.25" Filter:

• Designed for capturing solar activity in the Ca-K spectral line.
• Substrate made of double-polished glass with high-temperature resistance.
• High optical density levels at OD3 and OD5 outside the pass band.

Technical Specifications:

Filter Type: Solar Bandpass Filter

Filter Diameter: 1.25"

Filter Shape: Round

Substrate: High-temperature resistant glass

Transmitted Bands: Ca-K (393 nm)

Peak Permeability (CWL): 393 nm

Half Bandwidth (FWHM): 3 nm

Equivalent Optical Density (200 - 1200 nm): OD5

Blocking Efficiency (200 - 1200 nm): 99.999%

Equivalent Optical Density (1200 - 1500 nm): OD3

Blocking Efficiency (1200 - 1500 nm): 99.9%

Frame: Black, Anodized

Included in the Set:

• Antlia CaK Filter 3 nm 1.25"

Warranty:

This filter comes with a 24-month guarantee.