About this product
Model: antlia_solar_5a_cak
Part Number: 5Å CaK
Antlia Solar Discover 5Å CaK Assembly 5Å CaK
The Antlia Solar Discover 5Å (0.5nm) CaK assembly incorporates a set of light-reducing filters to reduce solar heat ingress for safe operation during solar imaging.
It is specifically engineered to enhance imaging contrast for Plages and light Bridges, prominent features in the CaK 393.3nm line, and sunspots.
The Antlia 5Å Ultra Narrow Bandpass Filter is built in; it features a clear aperture of D12mm (B1200), and a wavelength centred on the Calcium II K-Line at 393.3nm. Its ultra-narrow full width at half maximum (FWHM) of 0.5nm enables the capture of details in the Chromosphere.
Installation is similar to the Antlia CaK 3nm Solar Herschel Wedge, with the telescope attached at one end and the camera at the other. The metal tube CNC is machined from aircraft aluminium and anodised. The filters are assembled within a fully enclosed tube, preventing stray light ingress/egress.
Important Notes
- With no Barlow lens, the telescope must have a focal ratio greater than F7
- Optional 2x, 3x and 5x Barlow lenses specifically designed for use with the Solar Discover 5Å CaK assembly are available. Please refer to the installation diagram.
- Antlia offers optional 50mm and 70mm extension tubes for better focus. If required, please order them separately.
- When using a star diagonal or a Barlow lens supplied by other manufacturers, the ERF filter must be installed in the correct position for safe operation. Please refer to the installation diagram.
- When you are using a telescope with an aperture greater than 100mm, you need to use additional light reduction solutions, such as an ERF filter, for safe operation while using Solar Discover 5Å CaK;
- Without the extra light reduction solution, the Solar Discover 5Å CaK can only be used with REFRACTORS with an aperture of up to 100mm.
About Visual Observation
The bandpass of CaK (393.3 nm) is almost invisible to the human eye; hence, the Antlia Solar Discover 5nm CaK assembly is primarily used for solar imaging and is not recommended for visual observation due to the difficulty many observers experience seeing the CaK line.
In addition, the IR coating range of Antlia products is slightly different from the ISO 12312-2 Standard for Solar Viewers. Please see the following chart and refer to the ISO 12312-2 Standard for Solar Viewers (https://eclipse.aas.org/eye-safety/iso12312-2).
We do not recommend using the Solar Discover 5nm CaK Filter assembly for visual observation.
Warranty: 3-years
Disassembly of the assembly is prohibited and voids the warranty.
Specifications
| ISO12312-2 Transmittance Requirements | | Antlia Transmittance Requirements |
| Requirements | Value | Wavelength Range | Wavelength Range |
| Tmax% | 0.0032% | 380-780nm | 380-780nm |
| Tmin% | 0.000061% | 380-780nm | 380-780nm |
| Tmax%（UVB | 0.0032% | 280-315nm | 280-315nm |
| Tmax%（UVA） | 0.0032% | 315-380nm | 315-380nm |
| Tmax%（IR） | 3% | 780-2000nm | 780-1700nm |
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