Antlia Solar Discover CaK Calcium-K 5A Imaging Solar Filter Assembly

The Antlia Solar Discover 5Å 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, Light Bridges, features prominent 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 centered on the Calcium II K-Line at 393.3nm. With its ultra-narrow full width at half maximum (FWHM) of 0.5nm, it 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 another. The metal tube machined from aircraft aluminum CNN and oxidized. The filters are assembled within a fully enclosed tube, preventing stray light into it.

Important Notes

• If you do not use the Barlow lens, your telescope must has a focal ratio ＞7.
• Optional 2X,3X and 5X Barlow lenses are available, Antlia specifically designed for Solar Discover 5Å CaK ; please order them separately if required. Please refer to the installation diagram and an installation video can be supplied for your reference.
• Optional 50mm and 70mm extension tube are provided by Antlia for better focus. please order them separately if required.
• When you are using a zenith mirror, or Barlow lens supplied by other manufacturer, 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 ＞100mm, you need to use additional light reduction solutions, such as ERF filters，solar safety films, lowering the telescope aperture for safe operation while using Solar Discover 5Å CaK; If without the extra light reduction solution, the Solar Discover 5Å CaK can only used with REFRACTORS up to 100mm aperture.

Product Installation Diagram

About Visual Observation

The bandpass of CaK (393.3 nm) is almost invisible to the human eyes, hence, the Antlia Solar Discover 5Å CaK assembly is primarily used for solar imaging and not recommended for visual observation due to the difficulty of many to visually see information that CaK has to offer.

In addition, the IR coating range of our products is slightly different from the ISO 12312-2 Standard for Solar Viewers, please see the following chart and refer to ISO 12312-2 Standard for Solar Viewers (https://eclipse.aas.org/eye-safety/iso12312-2)

For tough technical requirements and safety considerations, we do not recommend Solar Discover 5Å CaK assembly for visual observation.If you need to use the product for visual observation, it is important to ensure that all filters built into the assembly are in good condition for safety.

Please contact Antlia if you have any questions.

Warranty: 3-years

Disassembly of the assembly is prohibited and voids warranty. Any repair/returns/exchange for this item is not accepted once it has been disassembled.

Product Structure Diagram