6D AF and Focal Plane issues by recomposing

[Frage]

Hello,

I would like to know your thoughts on this topic.
How difficult could be to work with a 6D and a fast lens if you have to recompose (focal plane distance changes) and want to achieve a shallow DOF ?

 

[robbymack]

No more difficult than any other camera using the same technique.

 

[Loswr]

http://www.visual-vacations.com/Photography/focus-recompose_sucks.htm

http://digital-photography-school.com/the-problem-with-the-focus-recompose-method

 

[Frage]

http://www.visual-vacations.com/Photography/focus-recompose_sucks.htm

http://digital-photography-school.com/the-problem-with-the-focus-recompose-method

Great links, thanks!

Since recomposig sucks (visual-vacations.com dixit), I was just wondering how it all happens on a 6D.

 

[nightbreath]

There are 3 options I know to avoid focus error while recomposing:
1. Focusing on a subject that is located at the same distance as your subject.
2. Moving yourself forward / backward after recomposing to compensate focus shift.
3. Using AF microadjustment (this one is tricky).

 

[Frage]

No more difficult than any other camera using the same technique.

I am not sure about it. Maybe with some cameras you can lock the focus and let the AF system track this spot for you while you recompose. But as I said, I am not sure about it.

 

[Loswr]

I am not sure about it. Maybe with some cameras you can lock the focus and let the AF system track this spot for you while you recompose. But as I said, I am not sure about it.

Yes, I suppose you could use AI Servi to 'track' to an outer AF point. But that's not focus-recompose, and if you're going to do that, why not just select the outer AF point directly?

 

[Frage]

I am not sure about it. Maybe with some cameras you can lock the focus and let the AF system track this spot for you while you recompose. But as I said, I am not sure about it.

Yes, I suppose you could use AI Servi to 'track' to an outer AF point. But that's not focus-recompose, and if you're going to do that, why not just select the outer AF point directly?

Sorry, my english ist quite poor. Maybe I don´t want to say "focus-recompose" but just recomposition. Sometimes you want to recompose to lock the focus and the measured light.
Well, sometimes you just have not the time to do that in single steps. You just may not get the shot.

 

[Loswr]

You can lock exposure separately from focus. The bottom line is that if you lock focus then move the camera when shooting with a very thin DoF, you'll get backfocus.

 

[Frage]

I see... I just foud out what you can not do with the 6D. I was just interested in this cam, but I think not anymore.

 

[robbymack]

I see... I just foud out what you can not do with the 6D. I was just interested in this cam, but I think not anymore.

I wouldn't call it a deal breaker just something you have to be mindful of. It also something that can't be overcome with good technique or simply realizing the limitations of what you and cant do. Is it fool proof? No, but then again nothing really is.

 

[Frage]

I see... I just foud out what you can not do with the 6D. I was just interested in this cam, but I think not anymore.

I wouldn't call it a deal breaker just something you have to be mindful of. It also something that can't be overcome with good technique or simply realizing the limitations of what you and cant do. Is it fool proof? No, but then again nothing really is.

Well by the nowdays tech a decent 3d tracking is something that I personally would expect in a ~2000 € body.

 

[Loswr]

The 6D has AI Servo tracking - but when you use the word 'recompose' that implies you're not using it.

 

[nightbreath]

There's also Live View focusing that might work for you

 

[robbymack]

I see... I just foud out what you can not do with the 6D. I was just interested in this cam, but I think not anymore.

I wouldn't call it a deal breaker just something you have to be mindful of. It also something that can't be overcome with good technique or simply realizing the limitations of what you and cant do. Is it fool proof? No, but then again nothing really is.

Well by the nowdays tech a decent 3d tracking is something that I personally would expect in a ~2000 € body.

I don't think we are talking about the same thing. Focus and recompose to me (and to pretty much everyone) means you lock focus on the subject then recompose the frame (by moving the camera) then click the shutter. This does shift the focal plane and if you are using a razor thin dof you'll end up with some back focus most likely. 3d tracking? I have no idea what you are talking about unless you are simply talking about servo mode in which case I don't think you'll be using focus/recompose. What exactly do you want the camera to be able to do for you?

 

[Frage]

I see... I just foud out what you can not do with the 6D. I was just interested in this cam, but I think not anymore.

I wouldn't call it a deal breaker just something you have to be mindful of. It also something that can't be overcome with good technique or simply realizing the limitations of what you and cant do. Is it fool proof? No, but then again nothing really is.

Well by the nowdays tech a decent 3d tracking is something that I personally would expect in a ~2000 € body.

I don't think we are talking about the same thing. Focus and recompose to me (and to pretty much everyone) means you lock focus on the subject then recompose the frame (by moving the camera) then click the shutter. This does shift the focal plane and if you are using a razor thin dof you'll end up with some back focus most likely. 3d tracking? I have no idea what you are talking about unless you are simply talking about servo mode in which case I don't think you'll be using focus/recompose. What exactly do you want the camera to be able to do for you?

Something like that, actually.
Nikon 3D Auto-focus Tracking]
[url=http://www.youtube.com/watch?v=7EfA1mesLhA#ws]Nikon 3D Auto-focus Tracking[/url]

 

[Frage]

There's also Live View focusing that might work for you

Live View focusing and Canon in the same life?

 

[nightbreath]

There's also Live View focusing that might work for you

Live View focusing and Canon in the same life?

Why not? Live View makes the whole image sensor a big autofocus area. If you have time to recompose, you might use Live View instead of recomposing.

I've used that a few times for group shots using 7D with 50mm @ f/1.4 when the whole group made one straight line. This approach gave me high-precision focus with nice blurred-out leaves in 2 meters after the subjects.

 

[Loswr]

Nikon's 3D tracking = Canon's AI Servo.

 

[Frage]

Nikon's 3D tracking = Canon's AI Servo.

Oh, thanks. Thats exactly what I wanted to know. Now, does it work properly on the 6D?
I am just afraid, only the 5D MIII (not to mention the 1´s) can perform well in this discipline and €2800 are out of my reach.