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

**Bruce in Philly** · 01-09-2011, 06:29 PM

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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.

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