While I am new on these forums I have been on the Canon Rumors Forums for a few years now,
I really wanted to bring this too the attention of you and Canon as it is simply a highly important problem, those of you that don't know, the 5D3 suffers serious focus locking issues when a Canon speedite is attached in Low light, the AF assist beam causes lag with the AF from the 5D3, this makes it virtually impossible to achieve focus in low light when the speedlite is attached, I wanted to bring the topic to this forum, so I have pasted a link to all the discussion we have already had about this problem at Canon Rumors.com - see below
Please help in letting Canon know this is a very serious problem and effects the cameras performance in most working environments when a speedlite is attached and working in low light, conferences, nightclub work, weddings etc, and can stop the photographer completing the job or task.
I shot two gigs last night in very low light with the upgraded 5D3 and I am extremely happy. The new speed to locl AF makes it feel like a different camera -- probably up to half the time to lock than before I upgraded. I can't vouch for any of the other aspects of the firmware upgrade, but the AF lock speed with IR focus assist is WAY better now.
Canon: Please get the fix out for this on the 1DX ASAP! It doesn't seem reasonable to me that your flagship camera is lagging behind lower-end cameras for performance updates.
Posts the 2 wedding photogs. I trust these people.
This is me reporting back after the wedding.
Yeah...pretty big difference.
I never really complained about slow AF with the assist beam. I always felt it was deliberate, but nothing close to being a show stopper.
That said, even I noticed the improvement. Extremely responsive at the reception I was shooting tonight.
seemed to be much faster to me as well. Very responsive. Like it a lot.
We have another important update on this topic. A firmware update for the EOS-1D X has just been released. Firmware Update Ver. 1.2.4 incorporates functional improvements including AF speed improvement when using a Canon Speedlite’s AF-assist beam.
To learn more and download the update, click here.
i can categorically confirm this firmware hasnt fixed the issue for me....
its is particularly bad on my 5D3 with 70-200mm F2.8 IS USM II
Am an experienced wedding photographer... and this camera is driving me insane.. low light focus and usability is just non existent.
had a wedding on the weekend... and i cannot notice any difference pre and post firmware upgrade at all!
i cannot get this thing to lock focus... it just hunts and hunts.... and it happens on both my 5D3 bodies with a prime sitting on one and a zoom on the other... with 580 EX II sitting on both.
sorry not happy with the firm ware fix at all
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.