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Wratten W47 filter
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09-12-2021, 02:23 AM
Don Pensack
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Join Date: Aug 2006
Location: Los Angeles
Posts: 508
Here is a spectrum of a typical #47 filter:
https://www.cloudynights.com/topic/6...adc/?p=8343497
Should be excellent as an inexpensive CaK filter for imaging.
Don Pensack
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