----- Original Message -----
From: "Craig Zendel" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, December 01, 2006 7:57 AM
Subject: Re: EOS 5D and EF 300 f2.8L AF consistency ?
Malcolm,
I believe the AF targets on the 5D are larger than the indicators on the
screen, same as on other non-1D models.
The camera tends to pick the nearest point of high enough contrast within
the target.
If the heads are sharp in your 15 degree pics, but the body in your 5
degree, this could explain it.
CraigZ
Hi Craig,
I've done some further tests since posting, and it looks as though the
central AF sensor in my 5D extends slightly below the central square as
shown in the viewfinder. Consciously using the bottom line of the central
square as my aiming point raised the proportion of sharp results. I've also
used the 300 with a 2x MK II extender as described, and those too have shown
a better ratio of keepers. The big challenge now is to go back to
Stockgrove Park and get "every feather sharp" shots of mandarin ducks
lurking in the undergrowth!
http://www.greensand-trust.org.uk/stockgrove%20new.htm
http://www.geograph.org.uk/photo/2528
I have run a check using film in my EOS3 and that seemed to confirm that its
AF is better than that in my 5D. I also feel that the viewfinder ergonomics
are better for this work - the <red> AF spot in the lower border blinks in
AIServo mode to indicate that the AF hasn't locked on. Much easier to see
than the smaller green indicator in the 5D.
Must say I'm not too keen on having to buy a 1D body just to get properly
functioning AF - I like all other aspects of the 5D, and this problem has
only just shown up in this style of bird photography..
Cheers,
Malcolm
Milton Keynes, UK
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