Author Topic: Focus priority on 5D2 during burst mode with ai servo?  (Read 2398 times)

PhotoCat

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Focus priority on 5D2 during burst mode with ai servo?
« on: October 13, 2014, 04:33:07 PM »
Dear Magic Lantern Team:

Happy Thanksgiving for those in Canada & Happy Columbia Day for those in the US!
On 5D2, is it possible to force "focus priority" for the 1st shot taken in burst mode with ai servo?
That would be great help as 5D2 is defaulted to "release priority" for the 1st picture taken in burst mode during ai servo.
Focus priority is only turned on for the 2nd, 3rd, 4th etc... in burst mode under ai servo.  (assuming only centre point focus is used)

When bounced flash is used (meaning high flash power), many times the 1st pic in the sequence will get enough light yet out of focus.
The 2nd shot in the sequence will get the focus correct but it won't get enough flash light due to the relatively long recycling time of the flash.

Thanks & any workaround/pointers will be appreciated!


Walter Schulz

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Re: Focus priority on 5D2 during burst mode with ai servo?
« Reply #1 on: October 13, 2014, 05:16:17 PM »
Workaround:
1) Add more strobes.
2) Add more powerful strobes.
3) Add more power to your strobes = External power pack. Can and will fry plastic parts if overdone.

PhotoCat

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Re: Focus priority on 5D2 during burst mode with ai servo?
« Reply #2 on: October 13, 2014, 05:59:00 PM »
Tks Walter but I have added battery packs already but this seems a brute force way to make it work.
Many times the recycling is still not fast enough! We are talking about 5D2 burst mode about 0.25S interval here!
There is actually no need to use burst mode with ai servo in a wedding processional.
The only reason burst mode is used is because it allows "focus priority".   But it is not available for the first shot!
This is a dumb design by Canon imho, which is fixed in 5D3.

Is it possible to have ai servo working always in focus priority mode for 5D2? Thanks!