Back button focus (when set up correctly) gives you af-c and a psuedo af-s mode depending how you use the button. Is that what you want? Hold the button and get continuous focus. Let the button go and in effect you have af-s mode even though you are still technically in af-c. The downside is you do not get to choose focus priority, you are always in release priority.
If you mean switching from af-c to af-s, then you have that already at your fingertips with bbf as Cindy explained. Just let go of the back button after you focus. This is good for focus/recomposing. However, if you need to be able to lock focus before the shutter will fire, like for birds in flight see my next post below.You guys have answered my question (I think) I just want to quickly change from continuous A/F to single point A/F focus very quickly (without having to go to menu) You guys probably answered my question- thank you. I just need some time to digest the replies- busy today. Thank you- Paul
I'm having trouble understanding what Paul wants, too.
As Nick explained, if you want to switch between AF-C and AF-S, all it requires is to focus with the back button, remove your thumb from the back button, and recompose if desired. Then just press the shutter button to take the photo. That replicates AF-S.
Another alternative is to set up U1 or U2 with whatever change you want. My U1 is set up for BBF in Aperture Priority, AF-C. U2 is set up for BBF in Manual Mode, AF-C. My regular Aperture Priority is set for AF-S, and so are Manual Mode and Shutter Priority. All I need to do is to switch between U1, U2, or A (since I mostly shoot in Aperture Priority without BBF). I can quickly switch between BBF and no BBF.
All of my options are set for single point focus, but you can program U1 or U2 to use multiple focus points if desired.
You will only get the beep in some modes even though the beep is turned on. af-s with focus priority, for sure you will get the beep. And for sure you will not get a beep with bbf set up in the usual way, af-c with release priority. Not sure off hand if af-c with focus priority will beep. I know it won't with bbf set up.I'm trying different settings suggested, now have another problem in that it's not beeping when it gets focus- like it did before . tried to backtrack and find what I did-no luck, HELP please. Paul
You might have not had bbf set up 'correctly'. I say 'correctly', but there is no right or wrong. The textbook technique though is af-c with release priority and that won't beep because there is never a confirmed focus with that setup. I'll see if I can figure out what you might have set.Nick, I had bbf beep before I tried different settings. Wonder what I did?
Tried it. I think you must have had bbf set for af-s with focus priority. That will beep focusing with the back button. It won't really work right though. The bbf technique will not perform as you may have read about it set that way. Also, due to the behavior I described in a post above, setting the back button will override menu a1 and a2 so you will not really get focus priority even though you set it.Nick, I had bbf beep before I tried different settings. Wonder what I did? I got it-thanks
Not if you are using the "bbf technique" correctly. To use this as most people do, you need to be in AF-C with menu A1 set to release. Not af-s.Even if you use BBF, you are either in AF-S or AF-C mode and you still have select one or the other with the AF button on the side