Astrodon - 1.25" Mounted Photometric UVBRIc Johnson-Cousins Ic Edge Blackened Filter

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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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