interesting stuff Don - looking at your image and thinking about it a bit more I guess that the 720nm filters cut out most visable light but not all, so by adding an IR filter to your flash you are reducing the amount of visable light 'contaminating' the IR image. But that might just be twaddle! If possible I'd like to meet up at somepoint and see your set up and get some tips on this, probably best to leave it until after the half term though!!!
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