Actually you would be suprised how IR does effect it.
Heres a quote from the results of the article :
"CCD sensors are particularly prone to this problem because, as well as recording the visible spectrum, they are sensitive deep into the infra-red".
Full article is here :
http://www.astrocruise.com/articles/selong/selong.htm
The issue is compounded because the Sony CCD in the QHY-8 is very sensitive ti IR, even deep IR.
Recomendations are to use RGB only, and leaving out the luminance when its poor seeing.
I like using a clear filter, as it provides that extra signal for galaxies when imaging.
Theo