Removing AF from shutter release

[Bill W]

Just out of curiosity....how many of you have moved your AF from the shutter release to the AF-ON button? I have the 40D body.


I have found this change to be much better for capturing wildlife and my photography in general.


Was this a revelation on my part or just a standard operational procedure? In my reading I haven't come across any suggestions for this adjustment.


Thoughts?


Regards


Bill

[steve_m]

I went to a wildlife photography seminar last Sat. The seminar was presented by John and Barbara Gerlach. It was a good seminar. Anyway, they stressed using the back button for focusing. I tried it and I really like it.


For landscape shots, I find a focus point using the back button. Then recompose the shot and the focus stays the same but I can now recompose and shoot even if a focus point now happens to be in the sky. I love it!

[Mark Elberson]

On my 50D I have it programmed so that I can use either the AF-ON button or the shutter release to auto focus. If I don't want the shutter release to "over-ride" the AF-ON buttonI have to hold the AF-ON button while hitting the shutter release. I forget what custom setting this is, but for me I like that I can still use the shutter release to start AF if I want to without having to go into the custom menu.

[Bob]

<span style="font-family: 'Verdana','sans-serif'; color: black; font-size: 6pt;"]


<span style="font-family: 'Arial','sans-serif'; color: black;"]<span style="font-size: small;"]If you press and hold the "AF-ON" -- recompose, then press the shutter release, you are focusing on the AF-ON subject.<o></o>


<span style="font-family: 'Arial','sans-serif'; color: black;"]<span style="font-size: small;"]What are you doing different?<o></o>

[Bill W]

Bob, if your question is pointed towards me.


I have set my AF-ON/Shutter release to (located in Custom Function lV (C.Fn. lV): Operation/Others #2) in the Menu section of my 40D.


I use this setting for my wildlife photography (e.g. birds). It allows the exposure to be measured when the picture is taken, but you can press the AF-ON button to activate or halt the AF process as the bird jumps around on branches or flying.


I find this set up works faster and maintains focus for me while tracking a fast moving subject; i.e. maintaining IS (shutter button partially depressed) and quickly refocusing (by using my thumb to activate the AF-ON button) flying birds. Also, obviously, allows for re-composition w/a still bird.


I hope this helps clarifies what I'm doing and why Bob.


Regards


Bill

[Ehcalum]

I back button focus probaly 90% of the time, cept I use the astrick expouser lock rather than the af-on button because i shoot portriate in a vertical grip 98% of the time.

[Sinh Nhut Nguyen]

I don't use it, one less thing to memorize.

[Mark Elberson]

<span style="font-size: 6pt; font-family: 'Verdana','sans-serif'; color: black;"]


<span style="font-family: 'Arial','sans-serif'; color: black;"]<span style="font-size: small;"]If you press and hold the "AF-ON" -- recompose, then press the shutter release, you are focusing on the AF-ON subject.


<span style="font-family: 'Arial','sans-serif'; color: black;"]<span style="font-size: small;"]What are you doing different?

<div style="clear: both;"]</div>

There is one setting where AF is ONLY controlled by the AF-ON button which deactivates the shutter release as an AF trigger. There is another setting where AF is controlled by either the AF-ON button or the shutter release. I don't necessarily want to give up being able to AF with the shutter release but I do like the idea of being able to use the AF-ON button instead. With this particular setting though you have HOLD the AF-ON button or when you go to take the picture the shutter release button will re-focus.

[Keith B]

I don't use it, one less thing to memorize.

RIGHT!

[peety3]

I back button focus probably 90% of the time, except I use the asterisk exposure lock rather than the AF-ON button because I shoot portrait in a vertical grip 98% of the time.
<div style="clear: both;"]</div>

I assume this means you make the button swap because your grip doesn't have an AF-ON button.