I have set up back button focusing on my D7500 and it works OK. But the camera still takes pictures when not in focus. My AF-S and AF-C priority selections are both "focus." AF Activation is set to AF-ON only. My C1 Shutter-release button AE-L is set to OFF. I have the exact same settings on my D7000 and it works just fine. I must be missing something. Thank you.