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No, you can leave it on. The QHY-8 normally comes with a IR block, although you can also order a "Clear" filter too. The clear is mainly used for IR work, as the Sony sensor is very sensitive to IR.
The IR block is used on color to keep the color balance correct, as IR light effects exposures.
Mono cameras normally have a "Clear" IR pass filter, and thus you need a narrow band filter or whatever filter you place in, to have a IR block. Or you risk exposing the Narrow band light you want mixed with IR light.
In your case, its no problem, as you already have a IR block, so having another has very little effect.
Theo
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