Antlia CaK 3nm 393.3nm Filter

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Antlia CaK 3nm 393.3nm filter - 1.25''

CaK 3nm 393.3nm Filter Specifications

The Antlia Solar Wedge prism and internal CaK solar filter are made of heat-resistant double-polished substrate. Antlia CaK 393.3nm solar filter uses the most advanced multicoatings to produce a sharp 3nm narrow bandpass, designed to maximise contrast for high-resolution imaging of sunspots, solar surface granulation and other features prominent in CaK light.

A high blocking specification of OD5 (0.001%) between 200-1200nm wavelengths and OD3 (0.1%) between 1200-1500nm wavelengths delivers superb resolution for imaging with the Antlia Cak 3nm solar filter.   It should be noted that the bandpass for Cak (393nm) makes solar features almost invisible to human vision because of the eye's low sensitivity and poor resolving ability at the CaK frequency. Hence, the Antlia Solar Wedge with CaK filter is not recommended for visual observation. It is designed for imaging with cameras that have spectral responses well beyond human vision.

Warning Never look into the sun with the K-Line filter alone, although you don’t perceive it, there is a lot of harmful UV radiation entering your eye.

Note: This filter is included with the Antlia 3nm CaK Herschel Solar Wedge. You do not need to buy this filter separately if you own one. 

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