[COLOR=#333333]So apparently the above poster was slightly right, I didn't do my FULL research, I didn't realize there were different transmission rates of the filters
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I'm looking at the different filters on B&H's website.

The question is, if the film is sensitive to 720nm vs higher rated film at 850nm ... and one filter allows transmission beginning at the 700nm's mark where another only starts at 800 or 900nm ... will the film that BEGINS senisitivity at 720nm not pick up the higher rated filter's specturm at all, or will it just take longer to burn in since the IR sensitivity is higher up? so if I wanted even more contrast, I would choose the one that starts at 800 or 900 and expose for longer correct?