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PostPosted: Wed Feb 06, 2013 1:49 am 
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MTK, one thing that I have not seen anyone really answer is why your lens focuses fine on your older camera, but not as well on your 7D.
One of the best articles I have read on this subject is by Roger Cicala.
He produces quite a few interesting articles. (Some examples of auto-focusing can be found here and here.)

Also, with zooms, focusing can be different at different focusing lengths. So what might be fine close up could be a little off at a distance. The trick is using micro-adjust to compensate for what works best for you.

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PostPosted: Wed Feb 06, 2013 8:21 am 
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Well to sum up:

1. I have micro adjusted to +3 and will check out what this does to my picture.
2. I have switched back to the full auto focus point instead of spot.
3. I will try to see in the near future what my other lenses do. If any problems become apparent then I will try and micro adjust there too.

Thanks for the help and I will post updates soon.

@BleuDragon: Thanks those articles are very interesting. And they make a valid point. Hope I can fix my own problems by playing with the MFA and learning how to better use the AF of my camera.

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Cameras: Canon EOS 7D, Canon EOS 40D
Lenses: Canon EF 17-40/4 L USM, Canon EF-S 60/2.8 Macro USM, Canon EF 70-200/2.8 L USM, Canon EF 100-400/4.5-5.6 L IS USM
Want list: Canon EOS 5D Mark III, Canon EF 24-105/4 L IS USM, Canon EF 100/2.8 Macro L IS USM, Canon EF 500/4 L IS USM
Flickr: http://www.flickr.com/photos/mtkoopmans/
Website: http://www.mtkfotografie.nl


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PostPosted: Wed Feb 06, 2013 10:36 am 
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about switching all focus points on. I find it annoying, in so far that if any of the 19 cross points picks up something, it will focus on the closest one. It might be useful if you got a group of runners coming towards you, if you want the closest one as the main subject. I prefer to select where I want the camera to focus on, I move the single focus square around to suit

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PostPosted: Wed Feb 06, 2013 2:11 pm 
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That's not what he meant. He means he took it off "Spot" AF and put it back into "Full point" AF, i.e. He's still selecting his focus point, but he's using the whole point instead of shrinking it.

Hopefully these tweaks work out MTK!

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Canon EOS 5D MkII | Canon EOS 7D | Canon Digital Rebel XSi | EF 35mm f/1.4L | EF 50mm f/1.8 II | EF 85mm f/1.8 | EF 100mm f/2.8 Macro USM | EF 135mm f/2L | EF-S 18-55mm f/3.5-5.6 IS | 580EX II | LumoPro LP-120

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PostPosted: Wed Feb 06, 2013 2:36 pm 
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You are correct Plymer: I have set it to Full Point. Maybe my description was a bit confusing. Never use all points at once, since it is too unpredictable to me.

Forgot about another tweak too: gonna try an aperture of 7.1 as well. Should increase IQ a bit that way, and the DoF will be bigger. Will post my findings here :).

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Cameras: Canon EOS 7D, Canon EOS 40D
Lenses: Canon EF 17-40/4 L USM, Canon EF-S 60/2.8 Macro USM, Canon EF 70-200/2.8 L USM, Canon EF 100-400/4.5-5.6 L IS USM
Want list: Canon EOS 5D Mark III, Canon EF 24-105/4 L IS USM, Canon EF 100/2.8 Macro L IS USM, Canon EF 500/4 L IS USM
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PostPosted: Sat Feb 09, 2013 10:10 am 
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I'm posting in order to track this post. I'm new to DSLR and have had out-of-focus images and problems understanding all the possible focusing methods now available to me with my new Canon T4i even after reading the manual.

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http://www.PalaDolphin.com
My equipment are:
Canon Rebel T4i / EOS 650D
lens: EF-S 18-135mm 1:3.5-5.6 IS STM
lens: EF-S 55-250mm 1:4-5.6 IS II
lens: Tamron SP 60mm F/2 Di II 1:1 Macro
Canon Speedlite 380EX flash
Canon PowerShot G12
Canon AE-1 Programmable w/55mm, 200mm, & 24mm lenses
bag: Lowepro® SlingShot 202AW


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PostPosted: Sun Feb 10, 2013 12:41 am 
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PalaDolphin wrote:
I'm posting in order to track this post. I'm new to DSLR and have had out-of-focus images and problems understanding all the possible focusing methods now available to me with my new Canon T4i even after reading the manual.



check out these video`s they may help

here is a link to Gordon`s tips

http://www.dslrtips.com/

http://www.youtube.com/watch?v=FhJMdISfqME

http://www.youtube.com/watch?v=x4bQc36r5ek

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PostPosted: Mon Feb 11, 2013 9:42 am 
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No examples yet, but I did take out the 7D with my 100-400 to play again, and the results have improved hugely. Shooting with 7.1 and micro adjustment of +3 I can see a big step in sharpness even on subjects that are very far away and not that big on the picture. Cropping is now easily possible, without losing a lot of sharpness. Will play around with it a bit more, and will let you know what happens.

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Cameras: Canon EOS 7D, Canon EOS 40D
Lenses: Canon EF 17-40/4 L USM, Canon EF-S 60/2.8 Macro USM, Canon EF 70-200/2.8 L USM, Canon EF 100-400/4.5-5.6 L IS USM
Want list: Canon EOS 5D Mark III, Canon EF 24-105/4 L IS USM, Canon EF 100/2.8 Macro L IS USM, Canon EF 500/4 L IS USM
Flickr: http://www.flickr.com/photos/mtkoopmans/
Website: http://www.mtkfotografie.nl


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PostPosted: Tue Feb 26, 2013 8:43 am 
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What I've learned while experimenting with AF on my Canon T4i is that you really have to pay close attention to which AF points are active (red box). I initially let the camera just do its thing, which was a mistake:
Image
Image
The camera chose both an object that is closer, and the clouds which don't have much contrast. I also learned later on that embedded in each image file is the focus points used in AF and that the ZoomBrowserEX utility has a button named Show Auto Focus Points that will display them (the button has a cross on it).

So, I reviewed the out-of-focus shots and shot it again. It was only when I set the single center AF point on only and pointed it right at the top of the smoke stack where there's a contrast line that the camera's AF got it right:
Image
Image
On this last zoom-in you can even see the antennas on the top of the smoke stack. However, with almost every learning moment, it raises yet another question: How focused is completely focused? I consider 18MP high resolution, but inspecting it this close it starts to digitally jag out. I had to print it 8.5"x11" to realize that you cannot see the digital jags.

And yes, it was my, 'duh', moment. Hey, I'm new to DSRL AF.

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http://www.PalaDolphin.com
My equipment are:
Canon Rebel T4i / EOS 650D
lens: EF-S 18-135mm 1:3.5-5.6 IS STM
lens: EF-S 55-250mm 1:4-5.6 IS II
lens: Tamron SP 60mm F/2 Di II 1:1 Macro
Canon Speedlite 380EX flash
Canon PowerShot G12
Canon AE-1 Programmable w/55mm, 200mm, & 24mm lenses
bag: Lowepro® SlingShot 202AW


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PostPosted: Tue Feb 26, 2013 4:32 pm 
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"Duh" moments happen, and they're important... it's those moments of realization (however embarassing they can be at times) that cement understanding. We've all had them, but we're all better for them too :)

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PostPosted: Thu Feb 28, 2013 2:23 am 
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PalaDolphin's excellent visual tutorial illustrates something very important, that many seem to misunderstand. :)

I rarely let the camera decide where to AF. Unless shooting a very active subject, I use one AF point, and either move the AF point to my preferred place within the frame, or focus and recompose, depending upon the depth of field.

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PostPosted: Thu Feb 28, 2013 8:31 am 
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To be honest: I can't believe that there are ANY serious photographers that don't use just a single AF-point instead of letting the camera choose. The chances are just too big that it will not pick your intended subject as the point where it needs to focus.

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Cameras: Canon EOS 7D, Canon EOS 40D
Lenses: Canon EF 17-40/4 L USM, Canon EF-S 60/2.8 Macro USM, Canon EF 70-200/2.8 L USM, Canon EF 100-400/4.5-5.6 L IS USM
Want list: Canon EOS 5D Mark III, Canon EF 24-105/4 L IS USM, Canon EF 100/2.8 Macro L IS USM, Canon EF 500/4 L IS USM
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Website: http://www.mtkfotografie.nl


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PostPosted: Thu Feb 28, 2013 9:22 am 
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RexGig wrote:
PalaDolphin's excellent visual tutorial illustrates something very important, that many seem to misunderstand. :)

Where's the 'like' button? :lol:

RexGig wrote:
I rarely let the camera decide where to AF. Unless shooting a very active subjeDSct, I use one AF point, and either move the AF point to my preferred place within the frame, or focus and recompose, depending upon the depth of field.


This is one of the lessons they taught us in the DSLR 1 class held at my store, National Camera Exchange http://natcam.com/. My T4i has only 9 AF points, where the EOS 7D is 19; some cameras have as many as 51 AF points. But, unless you're shooting a moving subject, KISS (Keep It Simple Silly) and just use the center AF point, keep the shutter button down halfway and recompose.

This discussion prompted me to revisit my manual (pg. 99). Cross-type focusing is the fastest; it uses vertical and horizontal lines. Certain lenses only allow cross-type focusing on the center AF point, so it's good to read up on your lens. Or you could be lazy like me and get into a habit of using the center AF point and recompose.

The EOS 7D is supposedly a lot better:
http://www.learn.usa.canon.com/resources/articles/2011/whats_news_eos7d_article.shtml
Quote:
The actual AF system in the EOS 7D is entirely new to the Canon line, with an AF sensor having 19 cross-type AF points. Each and every point, including those located farthest from the center, is a standard-precision cross-type sensor, which can be used with any lens (or lens plus extender combination) with effective maximum apertures of f/5.6 or faster. Like the EOS 60D and 50D before that, the center AF point also has a separate, diagonal pair of high-precision line sensors, which provide even greater precision; these are automatically used with lenses f/2.8 or faster.


@MTK: So, have you tried viewing the out-of-focus photos in ZoomBrowser EX with the Show Auto Focus Points on?

_________________
-=- PalaDolphin
http://www.PalaDolphin.com
My equipment are:
Canon Rebel T4i / EOS 650D
lens: EF-S 18-135mm 1:3.5-5.6 IS STM
lens: EF-S 55-250mm 1:4-5.6 IS II
lens: Tamron SP 60mm F/2 Di II 1:1 Macro
Canon Speedlite 380EX flash
Canon PowerShot G12
Canon AE-1 Programmable w/55mm, 200mm, & 24mm lenses
bag: Lowepro® SlingShot 202AW


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PostPosted: Fri Mar 01, 2013 4:32 pm 
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@ Pala: Of course: but I didn't really have to because I am always well aware which focus point I manually selected. Mostly the middle one (when I need to crop anyway), but otherwise I select the point that is right on top of my subject.

_________________
Cameras: Canon EOS 7D, Canon EOS 40D
Lenses: Canon EF 17-40/4 L USM, Canon EF-S 60/2.8 Macro USM, Canon EF 70-200/2.8 L USM, Canon EF 100-400/4.5-5.6 L IS USM
Want list: Canon EOS 5D Mark III, Canon EF 24-105/4 L IS USM, Canon EF 100/2.8 Macro L IS USM, Canon EF 500/4 L IS USM
Flickr: http://www.flickr.com/photos/mtkoopmans/
Website: http://www.mtkfotografie.nl


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PostPosted: Mon Mar 25, 2013 8:23 am 
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Location: Almere, The Netherlands
Well after a while of testing, I have landed on +2 with my 100-400. This is absolutely the best setting I found, but now I have to try my other three lenses as well. Hope they don't need any tweaking whatsoever, but after this first experience with the 100-400 I am afraid that these will cost me a bit of time to find the sweet spot as well.

_________________
Cameras: Canon EOS 7D, Canon EOS 40D
Lenses: Canon EF 17-40/4 L USM, Canon EF-S 60/2.8 Macro USM, Canon EF 70-200/2.8 L USM, Canon EF 100-400/4.5-5.6 L IS USM
Want list: Canon EOS 5D Mark III, Canon EF 24-105/4 L IS USM, Canon EF 100/2.8 Macro L IS USM, Canon EF 500/4 L IS USM
Flickr: http://www.flickr.com/photos/mtkoopmans/
Website: http://www.mtkfotografie.nl


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