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Sorry for the incorrect info. Yes it is the colour channels that need IR blocking.
As for the IR component and the sensitivity of the ST7. I have a KAF0401E chip in my CCD camera that is similar to the ST7 (mine is non antiblooming).
I have tried imaging through a near infrared photographic filter on my VC200l. The scope has correctors in the draw tube so is not exclusively a reflector. The result was lots of signal in the near IR region with similar sensitivity to using a green filter when imaging a star field. I certainly have found a significant reduction in sensitivity when I image through a IR blocking filter but it does simplify focusing as the clear filter makes the colour filters par focal.
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