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  • Antlia Solar Discover Dualband Energy Rejection Filter (ERF) - 150mm

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    Antlia Solar Discover Dualband Energy Rejection Filter (ERF) - 150mm

    The Antlia Dualband Solar Energy Rejection Filter is designed by combining Hydrogen Alpha, Calcium K-Line and Calcium H-Line in one dualband filter. It is the filter used in conjunction with Antlia Solar Discover 3nm CaK, Solar, 5Å CaK or similar product to protect your solar imaging equipments from high temperature and bandpass shifting by rejecting massive heat before it enters telescope when imaging and observing solar.

    They are very effective at blocking the UV and IR part of the spectrum, and allow the desired wavelengths of Ha 656.3nm, CaK 393.3nm and CaH 396.8nm to pass through.

    Product Features

    • FWHM 25nm with CWL at H-alpha wavelength of 656.3nm; Transmission: T>95%
    • FHWM 25nm with CWL at CaK wavelength 393.3nm covering Calcium K-Line 393.3nm and Calcium K-Line 396.8nm; Transmission: T>90%
    • Coating Range: 200-1700nm wavelengths
    • Finished with the most advanced multi coatings
    • Coated on heat resistant double-polished substrate
    • Antlia ERF 130mm, 150mm,200mm filters are mounted in a housing/cell to hold it in front of a telescope tube
    • Antlia ERF 2’’ mounted filter is supposed to be installed at the back end of a refractor telescope, but before any other optical element(s), i.e. reducer, flattener, Barlow, star diagonal, prism etc.
    • Transmitted Wavefront: Lambda/4 or better.

    Product Specifications:

    Antlia Dual ERF Filter

    H-alpha

    CaK & CaH

    FWHM

    25nm

    25nm

    CWL (Central Wavelength)

    Ha 656.3nm

    CaK 393nm covering CaK 393.3nm & CaH 396.8nm

    Peak Transmission

    90%

    90%

    Coating Range

    200-1700nm

    Filter Thickness

    10mm+/-0.05mm

    Size

    ERF glass 130mm with cell, for 130-190mm Fixed diameter

    ERF glass 150mm with cell, for 150-220mm Fixed diameter

    ERF glass 200mm with cell, for 200-250mm Fixed diameter

     

    Spectral Transmission

    Important Notes

    - The Antlia Dual ERF filters cannot be used on its own. It must be used together with the professionally made solar imaging equipments, which have their own complete blocking filters assembled. Such as Antlia Solar Discover 5Å CaK, Solar Discover 3nm CaK Assembly, Dualband Ha, CaK and CaH filter Assembly;

    - Please do not use the Antlia Dualband ERF filter by itself for visual observation;

    - 2’’ ERF filter must working on 110mm or smaller refractors.

    Available Sizes

    • 2" (in a standard 2" filter cell),
    • Dia130mm,
    • Dia150mm
    • Dia200mm

    Warranty: 3-years

    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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