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Thread started 03 Jan 2006 (Tuesday) 07:51
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Release & Focus Priority

 
bokeh'ed
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Jan 03, 2006 07:51 |  #1

My understanding in Chuck Westfall's technical writeup on AI-Servo (external link) info, that the first frame of burst mode using AI-Servo does not guarantee sharp focus due to Canon's design of Release Priority of the EOS system.

And the paper goes on to say that subsequent burstshots are Focus Priority, ie, to say that, the camera won't fire until it achieves a good focus based on the 6 conditions.

Does it imply that:

(1) using C.Fn4-1, I can always get a tack-sharp first frame, ie, keep pressing the * button while aiming at the subject until i press the shutter release button?

(2) depending on the 6 conditions, i may not achieve the rated fps?

Thanks for ur inputs.




  
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bokeh'ed
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Jan 03, 2006 16:51 |  #2

No one?




  
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Jon
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Jan 03, 2006 17:16 |  #3

Well, if you don't keep pressing the '*', AI-Servo won't keep tracking, first shot or any shot. What Chuck's saying is that if you're shooting AI-Servo and press the shutter down all the way, the camera won't hesitate because there hasn't been a focus solution. It'll take picture 1 and continue refining the solution as long as the shutter's held down. But if you don't keep the '*' depressed, it won't focus. So, for continuous AI-Servo shooting with CF4-1, you need to keep both the shutter and the '*' depressed. Let up on the shutter and you start a new AI-Servo sequence. Let up on the * and you stop the focus tracking.
It's possible to conceptualize a combinatioon of the stated 6 conditions that would interfere with full rated fps. But it'd be fairly bizarre, requiring erratic motion of a subject with low to no contrast, occasionally moving in and out of a situation where it would present stronger contrast (directional light and shadows, say).


Jon
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Release & Focus Priority
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