bhollis
Veteran Member
See my post above.
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AF ON button - I finally get it
- Thread starter pkeairnes
- Start date
tko
Forum Pro
You can assign the ability to switch between one shot and AI servo to the preview button. Hold the DOF preview down, the focus mode switches till you let it go. I think I'm going to find this very useful for sports.
My big problem is I've got it in AI servo, but then I need to focus and recompose for one shot, which of course only works w/one shot. Say I'm going to pre-focus on where an athlete is going to be, rather than follow him. That requires one shot, so hold the DOF preview in and you've got it.
http://ktophoto.blogspot.com/
http://la-photos.blogspot.com/
My big problem is I've got it in AI servo, but then I need to focus and recompose for one shot, which of course only works w/one shot. Say I'm going to pre-focus on where an athlete is going to be, rather than follow him. That requires one shot, so hold the DOF preview in and you've got it.
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http://ktophoto.blogspot.com/
http://la-photos.blogspot.com/
It’s still an extra step with the toggle. Not what I would call on the fly. Using AF ON button will save you even that step. Like I said before there is really no downside of using AF ON, just need to get used to it. What not give it a try?
I used this method with the 10D and the 20D. With the 50D I use it also but I have the " " button as the AF button. This leaves the AF button as the FEL button. On the older xxD models when you used the back button to focus you lost the ability to FEL(flash exposure lock).
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LT
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LT
Oh yes. Forget about that one.
I left my shutter button engaged, as it doesn't seem to affect the function of the AF-ON button. That gives me the flexibility to use either button depending on the situation.
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http://www.flickr.com/photos/39169343@N04/
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http://www.flickr.com/photos/39169343@N04/
I read here that this was unreliable. Being on either one or the other was better.
True. Unless you want to pre-focus on a place, such as 2nd base in baseball because as soon as you press the shutter to take the pic, the focus changes.
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Steve
pkeairnes
Member
Thanks, that's a very helpful article. I'll have to read through the other articles on that site.
bhollis
Veteran Member
I do use the AF-ON button to focus. But I still toggle between one-shot and AI servo, depending on whether I'm shooting static or moving subjects. I've found my camera focuses most accurately on static subjects in one-shot vs. AI servo.
So, if my camera happens to be in AI servo, and I spot a static subject/landscape I want to shoot, I just toggle to one-shot using the dof preview button and take my shot. The reverse works equally well. Maybe not for everyone, but it works well for me.
So, if my camera happens to be in AI servo, and I spot a static subject/landscape I want to shoot, I just toggle to one-shot using the dof preview button and take my shot. The reverse works equally well. Maybe not for everyone, but it works well for me.
So I have been going through the manual and frankly this section is poorly written IMO. The DOF button will not work for me for flipping between one shot and AI servo because I do not want to hold down another button. I'll just switch the usual way.
The shutter button can be switched to Metering Start. Pretty basic.
The AF-ON does not have a stand alone shutter release function. So the choice here is Metering and AF Start unless the AF-OFF is a good one to select. Again another button to hold down.
For example I am in AI Servo. So I guess that setting the AF-ON to Metering and AF start and the Shutter to Metering Start is the ticket. I am assuming based on what it says that when I press the AF-ON both Metering and AF start and then when I press the shutter button the metering is overwritten from the AF-ON function. Am I on the right track? Or does registering the focus point give you more control?
The shutter button can be switched to Metering Start. Pretty basic.
The AF-ON does not have a stand alone shutter release function. So the choice here is Metering and AF Start unless the AF-OFF is a good one to select. Again another button to hold down.
For example I am in AI Servo. So I guess that setting the AF-ON to Metering and AF start and the Shutter to Metering Start is the ticket. I am assuming based on what it says that when I press the AF-ON both Metering and AF start and then when I press the shutter button the metering is overwritten from the AF-ON function. Am I on the right track? Or does registering the focus point give you more control?
hdngo1
Leading Member
Would some one explain how to do it? I would like to know too, is it for 40D or some other camera only? Thanks
marsbar
Leading Member
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marsbar
Leading Member
IF your in AV or TV mode and use exposure lock, hold the * button and turn the wheel near the shutter, and it will change the shutter speed and aperture, just like in P mode, when you do program shift.
This is handy if you want to make quick change on the fly
EDIT: whoops sorry about double post!
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This is handy if you want to make quick change on the fly
EDIT: whoops sorry about double post!
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Yea... if someone could explain how to set it (7d) up to where the shutter release button doesn't focus on the half press... and the AF-ON button does focusing then it would be greatly appreciated. I tried deciphering that section in the manual but it is a little confusing for me also. And I didn't see anywhere how to setup the preview button to toggle between the two focusing modes. If that could be explained on how to setup (or if someone could point in the manual where it talks about it and maybe decipher it) that would be awesome.
Thanks.
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-Brock
A few of my images: http://www.brockbarnes.com
Thanks.
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-Brock
A few of my images: http://www.brockbarnes.com
Yea... that is where I was reading... 217 through 221. I just wasn't sure which assignable function would go with which control. Trying to decipher this... would I assign the One-Shot AI SERVO to the depth of field preview and then assign AE lock to the shutter release button?
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-Brock
A few of my images: http://www.brockbarnes.com
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-Brock
A few of my images: http://www.brockbarnes.com
"would I assign the One-Shot AI SERVO to the depth of field preview"
Yes
"and then assign AE lock to the shutter release button"
No, assign Metering start. The default is AF start and Metering start.
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http://www.flickr.com/photos/39169343@N04/
Yes
"and then assign AE lock to the shutter release button"
No, assign Metering start. The default is AF start and Metering start.
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http://www.flickr.com/photos/39169343@N04/
ok... a million thanks! I had my old XT & XTI setup that way (not with the depth preview button though)... but for some reason I couldn't wrap my head around it with this 7D. I'm gonna have to purchase an 3rd party manual because this one just goes right over my head on a lot of stuff.
Thanks again.
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-Brock
A few of my images: http://www.brockbarnes.com
Thanks again.
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-Brock
A few of my images: http://www.brockbarnes.com
The easiest way is to go to the quick menu and go down to the camera icon. There you can find the shutter release and AF ON icons. Just remove AF from shutter release button and add AF to the AF ON button. Only on 7D you can do it this way. Other cameras you need to go deep into the custom function to make the change. Another great feature on 7D.
Yea... if someone could explain how to set it (7d) up to where the shutter release button doesn't focus on the half press... and the AF-ON button does focusing then it would be greatly appreciated. I tried deciphering that section in the manual but it is a little confusing for me also. And I didn't see anywhere how to setup the preview button to toggle between the two focusing modes. If that could be explained on how to setup (or if someone could point in the manual where it talks about it and maybe decipher it) that would be awesome.
Thanks.
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-Brock
A few of my images: http://www.brockbarnes.com
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