Disable Shutter Button From Focusing MKIII

I've read the manual till I'm blue in the face, and have only halfway succeeded in using the AE lock button to achieve focus. I can't seem to get the right combination of custom functions to stop the shutter button from focusing.

Using One Shot Mode.

When I press the AE lock button the camera does focus. However, if I first simply depress the shutter button halfway (without touching the AE lock button), the camera will focus as well.

So, I have two points on the camera that focus, the AE lock button, and the shutter button.

The other problem is that if I achieve focus with the AE lock button, then recompose, pressing the shutter button causes a new focus to occur.

What settings will enable me to stop the shutter button from focusing at all?

Thanks.

im pretty sure there is a custom function that will set the shutter to AE Lock and the * button to focus lock.

there is at least on the rebel XTi.

on the rebel its c.fn 04 set to 1 instead of 0. maybe its the same on the MKIII

mizouse wrote in post #4130829
im pretty sure there is a custom function that will set the shutter to AE Lock and the * button to focus lock.

there is at least on the rebel XTi.

You're right, but I'm having a heck of a time getting the right combination.

Answered my own question.

"M" stands for manual. In my case "M" stands for moron.

In Av/Tv mode things work like I set them. AE Lock button focuses, and shutter button locks exposure.

For whatever reason (call it advancing age) I expected the same behavior in manual mode.:o

It's way past my bedtime.

stefeb wrote in post #4130906
Answered my own question.

"M" stands for manual. In my case "M" stands for moron.

In Av/Tv mode things work like I set them. AE Lock button focuses, and shutter button locks exposure.

For whatever reason (call it advancing age) I expected the same behavior in manual mode.:o

It's way past my bedtime.

i'm going to guess that you just don't realize the importance of M when the conditions call for it

as for cf.n, what you want is c.fnIV 1-3 and cfn IV 2-1

stefeb wrote in post #4130906
Answered my own question.

"M" stands for manual. In my case "M" stands for moron.

In Av/Tv mode things work like I set them. AE Lock button focuses, and shutter button locks exposure.

For whatever reason (call it advancing age) I expected the same behavior in manual mode.:o

It's way past my bedtime.

Do what?

My shutter button never has anything to do with focusing regardless of what shooting mode im in...Av,Tv,M...It doesnt matter. I dont have the camera in front of me, but I just set the shutter button to either Meter+AElock or just Meter depending on what Im doing. The AF-on button controls focusing.

basroil wrote in post #4131100
i'm going to guess that you just don't realize the importance of M when the conditions call for it

as for cf.n, what you want is c.fnIV 1-3 and cfn IV 2-1

I shoot in Manual 98% of the time. Just was having a mental block.

Thanks for the cf.n settings. It was confirmation of the settings I have set.

AdamLewis wrote in post #4132021
Do what?

My shutter button never has anything to do with focusing regardless of what shooting mode im in...Av,Tv,M...It doesnt matter. I dont have the camera in front of me, but I just set the shutter button to either Meter+AElock or just Meter depending on what Im doing. The AF-on button controls focusing.

At this point I'm not sure, but I think when I first experienced the "problem" I may have been in AI servo mode.