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  • Antlia CaK Calcium-K 3nm 393.3nm Imaging Filter - 1.25" Mounted

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    Antlia CaK 3nm 393.3nm Imaging Solar Filter - 1.25'' Mounted

    The Antlia CaK solar filter is made of heat resistant double-polished substrate. The Antlia CaK 393.3nm solar filter uses the most advanced multi coatings to produce a sharp 3nm narrow bandpass, designed to maximize contrast for high-resolution imaging of sun spots, solar surface granulation and other features that are 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.

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

    Please note, a Cak 3nm 393.3nm filter is screwed in Antlia Herschel Wedge Prism. You do not need to buy it separately if you use our Herschel Wedge Prism.

    As authorised dealers for all our products they come with a full manufacturers warranty along with our satisfaction guaranteed, no-questions-asked full refund policy for a full 30 days.

    Please see our returns policy for full details.

    We ship direct from UK warehouses and provide free shipping on all purchases within England, Scotland and Wales (Excluding highlands and Islands)

    We use UPS, DHL, DHL Express, Parcelforce or Royal Mail for all orders.

    Estimated delivery time is displayed at checkout.

    See our shipping policy for more details.

    Should you be outside the free shipping area then please contact us to discuss shipping options as prices vary depending on products and delivery location.

    Got questions? Read through our FAQ list to see if it's answered there! If not, please contact us via this form.

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