>>4080642After removing the IR cut filter, your camera's auto focus won't be calibrated properly. This needs to be done (if you got your camera professionally converted they should have done this - if they didn't you need a damn refund) in order for AF to work. Autofocus is *very* possible with infrared, my photos are all done using AF.
If you're just using a filter, the best option is to manually focus without the filter on and then carefully screw the filter in place. A tiny bump of the camera might be OK depending on if you're wide open or not.
