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  1. Astrodon - 50mm Unmounted Narrowband Square H-Alpha 5nm Filter

    $875.00
    SKU: ADO-HA5-50S

    In stock

    Bring out the faint structures In nebulae with the Astrodon H-Alpha Narrowband 50mm Unmounted Square Filter.
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  2. Astrodon - 50mm Unmounted Photometric UVBRIc Johnson/Cousins Ic Edge Blackened Filter

    $400.00
    SKU: ADO-IC-50R

    In stock

    UVBRI filters have been the standard for photometric measurements for decades.  They have evolved over time as technology changed.  H. Johnson in the 1950s and A.W.J. Cousins in the 1970s designed these filters for photomultiplier tubes (PMT).

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