Given the developments in IR cut filter technology and mirrorless cameras that leak IR light less and leave less to chance than earlier filter and camera combos did, is it still worthwhile investing in a filter like the Hoya R72 to experiment with IR photography on a modern mirrorless camera like the Sony A7RII/III etc - or is there so little information remaining for the sensor to grab after the OEM factory built-in IR cut filter on top of the sensor and the R72 filter mounted in front of the lens has cut off as much as they do that trying this turns out to be the digital photography equivalent of going on a couch safari without leaving the living room?