>> ... The birds were in flight and moving is was using aiservo in
>> appature prioity in sunlight. I was however able to capture some
>> shots but most were soft or out of focus.

Hi Harvey,

I suggest the following "required-reading" in the following link.
 http://groups.google.com/groups?ic=1&selm=3956D5C4%2EB35FE0F1%40nospam.net

If you want to use SERVO AF, you have to remember that this mode is RELEASE
PRIORITY for the first shot, then FOCUS PRIORITY for subsequent shots.

That means that the first shot with SERVO AF could be out of focus,
particularly if you only release one shot at a time.

I was recently shooting some Gannets at L'�le Bonaventure using my EF
100-400 IS USM on an Elan 7E. On the Elan 7E, the seven-point autofocus
couples perfectly with ECF. I can hold the shutter button half-pressed, then
change AF points by using ECF to follow the bird even thought it is not
perfectly centered in the viewfinder.

Cheers
Julian Loke

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