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Gary, for Autoguiding, and planet/lunar you won't need the IR filter. It may help but I've never noticed any difference with or without on the Moon.
Essential if you are imaging with it and there are stars in the FOV though. The IR filter stops blown-out stars.
But for guiding, no you won't need it.
There is a thread in here somewhere about placing the tiny IR filter from the lens into an adaptor.
I'll try find it.
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