Shooting in AF-S with AF-ON assigned to the AE-L/AF-L button I have the following experience. If I focus on an object no problem... focus achieved. If I then release the AE-L/AF-L button and recompose the shot so that the focused on object is now in a different place the shutter release will not fire. I can recompose the image back to the original positioning and the shutter will fire. If I then refocus and keep the AE-L/AF-L button half pressed while I recompose the shutter will fire. Is this how it should work? Derek
It sounds like you have Custom Setting a2 set to "Focus Priority". With that setting, in AF-S the camera will operate as you describe. Most folks who use the AE-L/AF-L button to focus choose AF-C with "Release Priority" selected for Custom Setting a1. That way, the camera will focus while you press AE-L/AF-L, but will always take the shot when you press the shutter release, whether the part that is then under the AF sensor is in focus or not
Typically when using AF-ON only for focusing, you operate in AF-C focusing mode. The default operation of AF-C is to use release priority. You probably are set to AF-S focus mode. The default for AF-S is focus priority. The focus priority is apparently prohibiting the shutter release when you change re-frame the image and put a different subject area at the focus point.
You could change the Custom Setting so that AF-S is also release priority. A better solution is to use AF-C. Using AF-C with AF-ON only gives you complete focus control without changing focus mode settings. If you want to lock focus just release the AF-ON button when focus is achieved. If you want to track a moving subject, just keep your thumb on the AF-ON button while releasing the shutter. The only caveat is that when you want to lock focus, you are the judge of whether the desired part of the image is in focus. You can use the dot in the viewfinder to help, but the focus locks when you lift your thumb, not when the camera determines the selected area is in focus.
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Brian, Gary. Thanks a lot for the quick response. That makes sense. I've had a quick play with the settings as you've both suggested and that resolves it. I'll just be a bit careful not to have introduced other problems as a result. I'll have a good play and check out the results properly.
I agree Ralph, I am surprised more people are not using that combination. I started using Fn for AE-L last year and found like you that it is more intuitive and comfortable, particularly on my camera that has both a dedicated AF-On and AE-L/AF/L button. Using the middle finger to control AE-L at the same time the thumb controls AF is much faster and surer using the thumb for both functions with buttons separated by a small distance. The added control is quite welcome on both the D800 and D7000. Stan St Petersburg Russia
Ralph, Stan. Thanks for the suggestion. I usually have fn set for Bracketing Burst but I've tried changing it to AE/AF lock and that works well. So, bottom line I've kept with fn set to Bracketing Burst but set fn to AE/AF lock under my U1 setting. I think that will work fine. Alternatively I may reverse this and have Bracketing Burst set to fn under U1.
It sounds like you've made a wise choice using the U1 option to switch back and forth. My only suggestion, if I may, is to set the Fn button to the function you anticipate using most often, which is probably AF lock.
You're absolutely right Ralph. I've swapped it around and set the Fn button as you suggest. I took a few shots yesterday and it worked just great.
>Derek, > >It sounds like you've made a wise choice using the U1 option >to switch back and forth. My only suggestion, if I may, is to >set the Fn button to the function you anticipate using most >often, which is probably AF lock. > >Regards, > >Ralph
Hi. In trying to set up my D7100 I was puzzled by the Bracketing burst option. When set up to use the Fn button it won't work unless I first push the Br button. It will then fire off the number of frames set even when set for single frame. It will also do so if set for Cl or Ch. However, since I must push the Br button first and could either bracket manually on S or in a burst on Cl I don't see the benefit. I still have to first turn on the Br button and hit Fn ,i.e.2 steps. If I ignore the Fn button,engage Br and either bracket manually of switch to Cl or Ch it would take the same time or less. I had first thought Bracketing Burst would bypass the need to hit the Br button. Also, according to the manual this setting doesn't work for U1 or U2. What am I missing here? Straighten me out. This is driving me to use AUTO!
>I'll just be a bit careful not >to have introduced other problems as a result.
Make sure your images are focused where you want. The problem I have with AF-C is exactly what it promises to do, which is fire the shutter regardless of where focus is. I may be unusually unsteady, or generally poor in my shooting technique, but I do better for sharp subjects with AF-S and ensuring I can put a focus point on the subject.
>Once you've back-button focused, and then press the Fn button >for AF-L, focus won't shift as you recompose - regardless of >the focusing mode you've chosen.
That's true, but with the AE-L/AF-L button assigned to "AF ON", using the Function button for AF-L is pretty much unnecessary. Once you let go of the AE-L/AF-L button, focus will stay where it was - unless you touch AE-L/AF-L again by mistake, of course
>>Once you've back-button focused, and then press the Fn >button >>for AF-L, focus won't shift as you recompose - regardless >of >>the focusing mode you've chosen. > >That's true, but with the AE-L/AF-L button assigned to >"AF ON", using the Function button for AF-L is >pretty much unnecessary. Once you let go of the AE-L/AF-L >button, focus will stay where it was - unless you touch >AE-L/AF-L again by mistake, of course
But Brian, this brings us full circle I think (although I'm now getting confused).
I originally had AE-L/AF-L button assigned to "AF ON" and AF-S set to "Focus". If I don't press the Fn button (assigned to AF-L) and keep it pressed, the shutter will not fire if I recompose the frame.
Forgive me if I'm missing something here (which is quite possible knowing me as I do
To have the shutter fire anyway, you just need to have the appropriate Custom Setting set to "Release Priority" rather than "Focus Priority".
The earlier posts above (e.g. Stan in #5) were saying that they allocate the Function button to AE-L (note - not AF-L) to lock exposure. I think post 12 may have confused this with allocating the Function button to lock focus, which isn't necessary when using AE-L/AF-L to act as AF-ON.
Thanks for your patience Brian, and for your detailed explanations. It's falling into place now and I have several solutions that will avoid the problem outlined in my initial post. In my own mind I kind of have a preference to have "focus Priority" as my setting but I need to think about that. Maybe that isn't that rational.
Anyway, lots of ways "to skin the cat". This has been very useful and thanks to all the inputs.
Btw earlier in this thread arnnad has asked a question about Bracketing Burst operation on the d7100. Although I could explain what I do with the D7000, which may be the same with the D7100, I'm not sure I'm best placed to help him. Derek
You are correct about letting go of the AE-L/AF-L button to lock focus. Keeping the AE-L/AF-L button pressed while recomposing will most likely cause the camera to hunt while in AF-A or AF-C modes.
However, I don't let go of the AE-L/AF-L button before pressing the Fn button. I tried it, but it just felt awkward to me, despite my having a fairly large hand. It is more comfortable, and the camera feels more secure in my hand, if I press and hold the AE/AF lock button while also pressing the Fn button. So I set f3 to AE/AF lock in order to prevent potential hunting
The good thing this shows is that there's no right or wrong way to do it - just what feels best.
There seems to be some confusion in how the various functions interact. The recommendation for AF-On was setting the AE-L/AF-L button to AF-On function. Set the AF-C mode to Release Priority, not Focus and set the focusing mode to AF-C. If you want to retain AE-L function, you can set Fn button to act as AE-L, not AF-L. Note that there are several options, one being AE-L+AF-L which is duplicating the AF-On function needlessly. If you use AE-L, which you should if you recompose, all you want it exposure locking assigned to Fn.
By setting the rear button to AF-On you have control of AF start and stop so recomposing to anything on the same focal plane as the one you focused on will remain in focus as you select your framing. So this acts like the best of both AF-S and AF-C modes, once you release the button, it stops further AF action. If your subject needs a different exposure than if under the AF point the metering was biased toward when recomposing, prior to recomposing, press AE-L so after recomposition, the metering of the subject will be the same as when you focused on it. These two functions go together intuitively and increase your control of what the scene and subject are subjected to by the capture process. On pro bodies there are dedicated AF-On and AE-L/AF-L buttons but they are next to each other so it is possible to hit the wrong one in rushed situations. So even with a pro body, using the Fn button for Exposure lock is better for me. That way both the D7000 and my D800 use the same process to focus and lock exposure. It is faster also since both buttons can be used at the same time, instead of sequentially. Stan St Petersburg Russia
I have programmed the AE-L/AF-L button to AF-On function. The D7100 seems to have 2 options for programming the Fn button for AE-L: AE-L (Hold) and AE Lock only. I am trying to shoot BIF. Which do you recommend?