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Thread: 5D MKII - AF Point Area Expansion - Tough Focus Situation

  1. #1
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    5D MKII - AF Point Area Expansion - Tough Focus Situation



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    Does
    this function affect ONE SHOT mode?<span> The
    manual notes it is only for AI SERVO but I get improved focusing on static
    subjects with it DISABLEd.
    <p class="MsoNormal"]I
    was shooting a few winter birds in my Leather Viburnam and having difficulty
    with auto focus due to the birds being buried in the bush.<span> There are many leaves surrounding and in
    front of these buggers and the birds are very small in the view finder. <span>I have center point only selected but got
    understandably erratic focusing.<span> So I
    checked the menu system and manual and found this function.<span> So I went back out and shot a few experiments
    and the focusing performance definitely improved with this function DISABLEd.
    <p class="MsoNormal"]
    <p class="MsoNormal"]Am
    I crazy or is the manual wrong?<span> I
    emailed Canon on this and will post their response if I get one.
    <p class="MsoNormal"]Below
    are links to cropped JPGs and its RAW to see what I mean by a tough auto focus
    situation:
    <p class="MsoNormal"]
    <p class="MsoNormal"][url="http://mywebpages.comcast.net/brucedebonis/5DMKII/IMG_3443.CR2]http://Junco1-RAW[/url]
    <p class="MsoNormal"][url="http://mywebpages.comcast.net/brucedebonis/5DMKII/IMG_3443E.JPG]http://Junco1-JPG[/url]
    <p class="MsoNormal"][url="http://mywebpages.comcast.net/brucedebonis/5DMKII/IMG_3560.CR2]http://Junco2-RAW[/url]
    <p class="MsoNormal"][url="http://mywebpages.comcast.net/brucedebonis/5DMKII/IMG_3560E.JPG]http://Junco2-JPG[/url]
    <p class="MsoNormal"]
    <p class="MsoNormal"]I
    am using a 5D MK II and a 70-200 2.8 IS II lens.<span> I shot RAW only then cropped and slightly
    tweaked in DPP.
    <p class="MsoNormal"]Oh,
    I do understand how to use live view/zoom to focus sharply but these birds are
    little divas and get very impatient.
    <p class="MsoNormal"]
    <p class="MsoNormal"]From
    the manual:

    <p class="MsoNormal"]C.Fn
    III -7 AF point area expansion
    <p class="MsoNormal"]0:
    Disable
    <p class="MsoNormal"]1:
    Enable
    <p class="MsoNormal" style="padding-left: 30px;"]When
    you select AI Server AF and the center AF point, the six Assist AF point (p.80)
    will also function. Seven AF points will track the subject.<span> This is effective for subjects that move
    erratically, making it difficult for only the center AF point to track it.

  2. #2
    Senior Member
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    Re: 5D MKII - AF Point Area Expansion - Tough Focus Situation



    You posted the exact same text and got plenty of answers on FM


    www.fredmiranda.com/.../971284


    Go read them and stop spamming the forums.

  3. #3
    Junior Member
    Join Date
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    Re: 5D MKII - AF Point Area Expansion - Tough Focus Situation



    Gee I am sorry that readers consider this spam. I made a very wrong assumption that not everyone reads all the forums.

  4. #4
    Senior Member neuroanatomist's Avatar
    Join Date
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    3,716

    Re: 5D MKII - AF Point Area Expansion - Tough Focus Situation



    Quote Originally Posted by Bruce in Philly
    I made a very wrong assumption that not everyone reads all the forums.

    You know what assumptions do, right - they make an ass out of, well...someone...but not you.


    I certainly consider it a legitimate question, and have no problem with you posting on multiple forums to elicit answers from a different user base.


    BTW, as I understand it, that C.Fn setting should have no effect on One Shot, and are only activated in AI Servo (and probably AI Focus) modes.

  5. #5
    Senior Member Jonathan Huyer's Avatar
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    Canmore, Alberta
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    Re: 5D MKII - AF Point Area Expansion - Tough Focus Situation



    Bruce, this is definitely not spam. I don

  6. #6
    Senior Member
    Join Date
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    Re: 5D MKII - AF Point Area Expansion - Tough Focus Situation



    Actualy, I never go to the fredmiranda site. I read the responses on that site and found them lacking.


    When the OP posted this I was actualy interested in hearing some responses.


    One would believe by reading the manual that these points only function when in AI Servo mode. But..... that is not what it specificaly says. It says when in AI Servo Mode these points will ALSO function. The word "Also" could mean several things, but it doesn

  7. #7
    Senior Member clemmb's Avatar
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    Re: 5D MKII - AF Point Area Expansion - Tough Focus Situation



    Quote Originally Posted by Jonathan Huyer


    Bruce, this is definitely not spam. I don't follow FM because I think that this forum is excellent and the people are (with the occasional exception) incredibly polite.
    <div style="CLEAR: both"]</div>

    I agree with you. Lets keep it polite. Why chase someone off the forum just for asking a question that was posted on another forum?


    Mark
    Mark

  8. #8
    Junior Member
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    Re: 5D MKII - AF Point Area Expansion - Tough Focus Situation



    Thanx all for the encouragement folks. I was a bit surprised by that response.


    Back to camera geek stuff.


    I did do a test of sorts and it is really easy for anyone to do and do quickly. I set my tripod up and aimed at a buried branch in my Viburnum bush. The reason I note the plant name is that if you are familiar with this plant in winter, it is not dense as you can see from pulling down one of my RAW pics above. It is what I think is a perfect test for this other than setting something up in studio. I set the tripod up in the same spot where I took these pics and used the same focal length of 200mm so the test is roughly comparable to the situation you see in the RAWs. You really should use a tripod as you don

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