At 09:43 01/12/2006 +0000, you wrote:
----- 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
***********************************************************
Hi,
using a 300mm F2.8 and the centre focusing point, it will be difficult to
obtain sharp images, slightest movement of the lens will cause the focus
point to move off a small subject.
Have you tried enabling the six invisible Assist focus points that are
clustered around the Centre focus point on the 5D?
It's custom function 17 set to 1, it gives you seven focus points in AI
Server mode with the centre focus point selected, these points are all
within the spot metering circle.
Regards Mick
*
****
*******
***********************************************************
* For list instructions, including unsubscribe, see:
* http://www.a1.nl/phomepag/markerink/eos_list.htm
***********************************************************
