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I have used an astronomik pro planet 742nm in the past to do long exposures on my QHY9 with some success although most CCDs QE drops pretty fast in NIR. I have bought an ASI462MC which is oddly more sensitive in IR than visible light. I also have very small filters 800nm and 900nm narrow(ish) band and the sensor of the ASI is only 6mm diagonal so I'll be trying to do long exposures with that. The camera is not cooled so I'm not sure how it's going to work but I'll give it a go and see what happens.
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