New to this forum so hoping someone can help me out. Just bought a d750 from MPB. I've been trying different setting and have run into a problem. The camera came with the AE-L/AF-L button functioning for both exposure and focus. I switched the focus to the half shutter focus because that's what I'm accustomed to using. I tried to switch it back to using the rear button for both, but can only get it to AE-L. I cannot get AE-L and AF-L to work at the same time. I've been to the control settings and have set it to both, but that hasn't work. I did a factory reset and that has not worked. If anybody have any other suggestions I would be most grateful. Thanks in advance.