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

Re: 5D3 + AF assist beam = slower focus

If I may summarize what I have read here, as a semi-professional photographer on the brink of making a 5D mark 3 purchase because of its marketed low-light capabillities:

 

To Mike,

 

I'm sure you are busy and don't have a lot of time to spend on the forums, but what ever you can contribute is greatly appreciated. There is a growing concern among 5D mark 3 owners regarding the AF performance, especially in low light situations and when using the Speedlight AF assist beam.  Discussion on this issue is very active over on the canonrumors.com site and a great many are posting here as well to try and engage Canon in the discussion.

 

if there is anything you can do to shed greater light on this topic that would be wonderful.   I think folks are restless for some answers or at least information to understand how the 5D mark iii works and how to work around this particular issue.  As you can imagine, these are photographers who have made a sizable investment, many of which are professionals in the 5D mark iii  target demographic -- wedding/event photographers.  They want the camera to fulfill the capabilities for which it has been marketed, and to excel in the areas that differentiate it from the competition (low light). 

 

Please share any additional information that you can, as is will be most enthusiastically received. thank-you for your time.

 

dll1477 

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

Re: 5D3 + AF assist beam = slower focus

What I really don't understand is how a major company like Canon would not do extensive field testing on their cameras

before release via the very professionals who will eventually use these products. This issue would come to light  immediately. I noticed it the first time out on the job....it was very obvious...not a subtle thing...and certainly not attributable

to user error or ignorance.

New Contributor
Posts: 1
Registered: ‎12-11-2012

Re: 5D3 + AF assist beam = slower focus

[ Edited ]

its been terrible - 3k down on a camera and AF does not perform as it should at low loght cameras with Canon's own flash system. What was Canon thinking?

 

problem persists with Canon 5dmk3, 70-200is mkII and 50mm 1.4

Occasional Contributor
Posts: 7
Registered: ‎12-10-2012

Re: 5D3 + AF assist beam = slower focus

I think we just did the field testing. Now we need the fix/adjustment based on the observed results.  I'm hoping they realize that these observations are coming from largely from experienced photogs and not newbies where user-error may play a role.  As for experienced users, I think it's fair to say that we are willing to learn and adapt our techniques where viable, but when something just plum doesn't work in the intended fashion, we have a legitimate gripe.

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

Re: 5D3 + AF assist beam = slower focus

interesting specific use case suggested over at canonrumors.  present very detailed test scenario including camera body comparisons, and ask  Canon to verify performance to specifications.  Mike we need you to weigh in!

Occasional Contributor
Posts: 5
Registered: ‎11-28-2012

Re: 5D3 + AF assist beam = slower focus

[ Edited ]

if canon are reading this, id like to make a sugestion.

 

 

theres a setting in the af section called "one shot af release prior." it has 2 settings, release and focus. focus is the setting that takes too long to focus, release is just a waste of time as the photo is always out of focus, however it takes the photo really fast.

 

my sugestion would be to make 5 levels of this instead of 2 so the user can choose the level.

 

 

anyone else think this may be a good solution?

 

 

www.marcdegroot.co.uk

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

Also a problem on the 1DX

I did a quick scan of the posts and I didn't see anyone mention that this problem also occurs on the 1DX.  I am a professional event shooter, so I am always trying to lock focus on subjects in dim situations and the added lag time for both the 5D3 and 1DX is absolutely unacceptable -- for a 1-series camera, it's almost unforgivable.

 

The lens I use most is the 24-70 f/2.8 and I have used both the original and new version with the same results.  For flash I use the 600 EX-rt.  For auto-focus, I usually use either zone (cluster or 9) or single point with expansion.  I've tried it with all points active, too, and that didn't seem to help.

 

One thing I have noticed is the 1DX (haven't tried this on the 5D3 yet) will fire before the AF illumination pops.  It seems that the camera grabs the initial focus, and then refines it before lighting up the focus point.  From what I can tell, the 1DX will fire after it gets the initial, which probably makes it as fast as I would want it to be, but I can't vouche for the accuracy of focus before it finishes refining.  I have the camera set to put the priority on focus instead of shutter release, so I'm surprised it fires before focus lock.

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

Re: Also a problem on the 1DX

Thanks for your input on the 1dx. I can tell you on the 5d3...if it fires before focus confirmation....it is usually soft

zim
Occasional Contributor
Posts: 6
Registered: ‎11-16-2012

Re: 5D3 + AF assist beam = slower focus

+100 Well said sir but it is wrong that so many pros are having to rely on 'Mike' for progress. He may already be with the fishes for putting his head above the wallSmiley Sad

zim
Occasional Contributor
Posts: 6
Registered: ‎11-16-2012

Re: 5D3 + AF assist beam = slower focus

That's +100 to dll1477, didn't say in previous post

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