Red and Blue

by Gordon

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I take it that you are using an unmodified camera for your IR images, you need the Hoya R72 filter as you cannot use the lower cutoff filters like a 650 or 680 as these are BVR ( barely visible red ) filters and only capture IR light on modified ( either full spectrum or a 590 ( Hoya 25A) conversion with the filter on the lens cameras. The cheaper 720 nm ...

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