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50mm f1.8 with IR focussing

Bought a step up ring the last weekend in Singapore and finally got to putting my Hoya IR filter on the 50mm prime lens. The first comment about the combination is that the pictures dont seem to be well focussed. This is by using the autofocus function in the camera. I tried to override using manual and adjust the focus and it just doesn't help when the lens don't come with a IR focus distance markers silkscreened onto it. Tried to shoot at f16 or more and it was slightly better. Didn't get this focussing problem with the kit lens 18-70mm DX lens. Will test aroung with it now that I'm going to spend the whole week at home...