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Occasional Contributor
Posts: 6
Registered: ‎12-11-2012

Re: 5D3 + AF assist beam = slower focus

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.

Super Contributor
Posts: 246
Registered: ‎11-11-2012

Re: 5D3 + AF assist beam = slower focus

Sounds good and thanks for the update. There are now 2 pro wedding photogs at POTN shooting weddings this weekend. I'll post thier  responses.    

Super Contributor
Posts: 246
Registered: ‎11-11-2012

Re: 5D3 + AF assist beam = slower focus

[ Edited ]

Posts the 2 wedding photogs.  I trust these people. 

 

1st

 

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. 

 

2nd

 

Ditto 

seemed to be much faster to me as well. Very responsive. Like it a lot.

Moderator
Posts: 1,399
Registered: ‎10-25-2012

Re: 5D3 + AF assist beam = slower focus

Hi everyone,
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.

Frequent Contributor
Posts: 49
Registered: ‎11-28-2012

Re: 5D3 + AF assist beam = slower focus

I actually sold my original mark 3 because of the AF problem...just got another one and uploaded the firmware...what a difference! I think the camera is just about perfect now. The next crusade issue.....the 630 RT's....a great advance and design for profession flash.....but the recycling has let me down....I will be starting a new thread on this today.

Respected Contributor
Posts: 1,861
Registered: ‎12-02-2012

Re: 5D3 + AF assist beam = slower focus

And no 2nd curtain flash on the new radio transmitter as I understand it.  What's the deal with that?

 

Scott

Canon 5d mk 4, Canon 6D, EF 70-200mm L f/2.8 IS mk2; EF 16-35 f/2.8 L mk. III; Sigma 35mm f/1.4 "Art" EF 100mm f/2.8L Macro; EF 85mm f/1.8; EF 1.4x extender mk. 3; EF 24-105 f/4 L; EF-S 17-55mm f/2.8 IS; 3x Phottix Mitros+ speedlites

Why do so many people say "FER-tographer"? Do they take "fertographs"?
New Contributor
Posts: 2
Registered: ‎06-18-2013

Re: 5D3 + AF assist beam = slower focus

[ Edited ]

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

Occasional Contributor
Posts: 22
Registered: ‎11-29-2012

Re: 5D3 + AF assist beam = slower focus

There are two issues of interest, at least to me :-) .  the issue addressed specifically by this thread is the use of the AF assist beam from a speedlite.  my testing shows, on my own 5D3, that this works very well.  at essentially "pitch black" conditions, my 5D3 works beautifully with AF assist, where the 580EX ii paints a nice pattern of light on the subject,enabling the camera to lock focus instantly.  within reasonable distances of course; 

 

 

the other issue at work is the AF performance itself in low light, without AF assist from a speedlite.  Canon specifies that the AF system is sensitive to EV -2, using the center AF point, f/2.8 and I assume a high contrast subject. 

 

 I performed an approximate test of this as well, by creating a lighting condition requring .5sec  at f/2.8 and iso 6400 to obtain a good exposure (thats EV -2 if my calculations are correct.), and my 5D3 captured focus just fine (I even acheived focus at  EV -3 but it wasn't dependable).  it takes a while (sometimes a few seconds) but this is, in my opinion, reflective of the accuracy and retry-credence algorithms present in the camera.  I have no problem taking that long to focus in that level of light because I'm usually not in a cave :-).  At that level of light, you can hardly see the subject anyway, much less a moving one :-).  keep in mind that the EV -2 sensitivity requires the center point.

 

in some ways, my tests were crude, i.e. I depended on the cameras own meter to roughly approximate EV -2.  In other ways, my tests were severe, in that I was using a 100mm macro f/2.8 handheld. I thought it was impressive to see the AF system lock onto what it surely sees as a moving target with very little light.  FYI I was using the default as-shipped focus mode. 

 

I repeated the above tests with my 70-200 f/2.8 IS II, obtaining similar results.  At approximately 15 feet subject distance and approximately EV +3, the AF assist even enabled focus on a very low contrast, dark subject (a treadmill belt, lol).

 

Occasional Contributor
Posts: 6
Registered: ‎12-11-2012

Re: 5D3 + AF assist beam = slower focus

I can absolutely confirm a vast improvement in AF lock after the firmware upgrade, but it's specifically when using the IR assist. 

 

I've never had any issues with my 5D3 and 70-200 combo with either the old or new version of that lens and I shoot lots of low-light events including weddings.  In very low light the center point is sometimes the only one that will lock, though.  It's not going to lock in near darkness, but I don't have any complaints at all with that combo and I use it a lot.

 

If you're getting performance as bad as you say in a reasonably low light, you probably have another problem.

 

 

New Contributor
Posts: 2
Registered: ‎06-18-2013

Re: 5D3 + AF assist beam = slower focus

i can assure you that i dont have another problem... when i have two seperate 5D3 and 2 580EX II ... with two different lens.. on it... a 24-70 and a 70-200mm ..and they are both patched to the latest firmware and all using centre point focus.. and im still getting that issue ?????

highly unlikely

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