robnsue86

Hey Simon, thanks for the response back and the various steps you have tried. That has to be frustrating. I think I was still a bit confused by what you are experiencing, but with this last response, i think I understand. Whatever button you attach to "AF-ON" works like back button, and when you depress that button, it "will" focus. But if you move the camera away from that target, it does NOT remain locked to the previous focus point, and hence if you go back to the same subject, you have to depress it again. Is that correct? So, a few questions. Does it happen with other lenses? Hate to ask this one, but have you reset your camera back to defaults, and start "from scratch"? You mentioned trying to restore from backup or change firmware, but have you wiped the camera back to default, and re-configure, as painful as that might be. I dont think it is firmware related to be honest. I have a feeling there is some other control that is causing this. It really sounds like the Pre-AF is somehow "on". It would be interesting to see if it follows different lenses. Regards,

Hey Simon, if I understand you correctly, your issue is that the AF-ON button on your X-T5 only keeps focus when you hold down the "AF-On" button, correct? So, if you are focused on say, a bottle, and you depress the AF-ON button, it focuses, but then when you move away, and back on the bottle, it has gone out of focus? So what happens when you just press it once? Does it not focus? It sounds like you "may" have the "Pre-AF" setting under "AF-MF" turned on. This will continually try to focus your X-T5 wherever you are pointing. And by default, Back button focus is already turned on by fact that the "AF-ON" button is programmed for just that. You still have to decouple the AF off of the shutter, but back button focus is already enabled out of the box. So, if you have the "AF-On" button programmed to be, in fact, "AF-On", then you are using back button focus. And hence each time you press the button, it will focus on what you are intending. If you keep it depressed, it will continue to keep focus wherever you move the camera. For a try, depress the disp/back button at bottom for a few seconds for the function menu to pop up and assign "AF-On" to another button on the back, and see if the behavior follows. If it does, then it isn't the AF-ON button. Hope that helps