... astronomical filter manufacture. The IDAS Narrow Band Nubula Photo-Visual (NBN-PV) filter is a new filter design using IDAS-unique ... spectral plot of the filter batch is provided with each NBN filter. For special applications requiring isolation of the H-beta ... . These are meant to be used in conjunction with an NBN filter or similar filter. 2. Optical IndexOutstanding transmission of 98 ...
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