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Thread started 21 May 2014 (Wednesday) 03:40
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6D AutoFocus is Horrible.

 
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TeamSpeed
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May 21, 2014 13:26 |  #31

Nissanfairladyz32 wrote in post #16920299 (external link)
It was designed to show the the auto focus is just as good as the 5D Classic and 5dII that i have used, ive heard bad things about it but real world testing that i have seen it keeps up just fine.

I don't remember any thread where people stated that the 6D AF was worse than the 5D or 5D2 (both sharing the same antiquated AF system). In fact, sentiment has been hugely in the favor of the 6D AF over the 5D/5D2. Canon's own marketing material, along with a ton of reviews, shows this to be the case as well.


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May 21, 2014 13:27 |  #32

zosobao5150 wrote in post #16920261 (external link)
I like these threads that are authored to seemingly justify the author's own purchase decision. Clearly the title was designed simply to get people to look, as I did, and then you get nothing new. Your pics look great.

Me too. usually followed by pictures posted from a 6d with the center focus point. The 5D guys picking them apart and the 6d guys getting all huffy because they didnt buy it to use a focus point other then in the center. The 5d guys will trump that with focus points while the 6d guys will rave about low light.
6d guys be like------5diii guys are a bunch of rich elitist
5d guys be like------6d guys are just full frame rebel owners

I find both entertaining and wish I had either camera :)




  
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May 21, 2014 13:28 |  #33

Scoobert wrote in post #16920307 (external link)
Me too. usually followed by pictures posted from a 6d with the center focus point. The 5D guys picking them apart and the 6d guys getting all huffy because they didnt buy it to use a focus point other then in the center. The 5d guys will trump that with focus points while the 6d guys will rave about low light.
6d guys be like------5diii guys are a bunch of rich elitist
5d guys be like------6d guys are just full frame rebel owners

I find both entertaining and wish I had either camera :)

The 5D/5D2 and the 5D3 are completely different animals. You cannot lump them into the same class. The 5D/5D2 had the old 9 point AF system where only the center point was reliable, provided you turned on expansion helper points. The 5D3 has the 1DX AF system. The 6D sits right in between, with a slight edge in really dark venue focusing with center point over the 5D3.


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Trench301
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May 21, 2014 13:46 |  #34

"No, its the widest the lens will go that rules this, not what the user sets the aperture to be when the shot is actually taken"

Ok...lightbulb moment! I get it now. Thanks for the clarification!


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May 21, 2014 13:51 |  #35

DwainRowe wrote in post #16920148 (external link)
I am curious why the usual 6D bashers haven't shown up in this thread yet. Could they be out shooting photos?

Nah. Couldn't be.

I'm curious why a thread was started with the main purpose of defending an inanimate object like a camera body. The actual value of the camera shouldn't really change with whatever people prefer to post in this thread.


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May 21, 2014 13:56 |  #36

pwm2 wrote in post #16920364 (external link)
I'm curious why a thread was started with the main purpose of defending an inanimate object like a camera body. The actual value of the camera shouldn't really change with whatever people prefer to post in this thread.

Agreed. These ALWAYS degenerates into a discussion as greatly simplified and characterized by Scoobert, above.

Very tiresome.


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May 21, 2014 13:57 |  #37

Nissanfairladyz32 wrote in post #16920299 (external link)
It was designed to show the the auto focus is just as good as the 5D Classic and 5dII that i have used, ive heard bad things about it but real world testing that i have seen it keeps up just fine.

I have no problem with this thread other than it's poor choice of a flame baiting title, so don't get me wrong, but in reading I keep seeing someone looking for a problem that didn't exist.

I have not shot a 6D, but EVERYTHING I have read seems to clearly reinforce the thinking that the 6D AF is a good step up from the 5d and 5DII. I feel the overwhelming consensus is that the 6D center AF point is one of the best ever for a Canon body, and that unlike the 5D2, you can handily use the off center AF points. Yes, as the lower priced high MP FF option, it is lacking some of the 5DIII bells and whistles, that's a simple fact, but I have never heard anything but high praise for the 6D AF, that it's center AF point may be better than the 5DIII etc..

Your thread seems to prove my feeling, that these vast swaths of detractors do not in fact exist?

Or maybe I just tend to ignore posts that are clearly ill informed?


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May 21, 2014 14:07 |  #38

"I feel the overwhelming consensus is that the 6D center AF point is one of the best ever for a Canon body"

So out of curiosity, what keeps Canon from making all of its autofocus points (beit 9,11,41,63 however many) from performing as well as the center point of the 6D? Is it a cost thing? Size thing? Processor speed? or a physical limitation of the AF system, or some other design complication?

Forgive if a stupid question, still trying to learn...


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May 21, 2014 14:16 |  #39

I have no fact based answer, but I have always assumed that since the AF point must necessarily function through the lens, that the center area of the lens is one deciding factor on why this seems to be true.

In the 6Ds case, with it's single center cross af point, I surmise it's a cost / market position decision not employ more cross type sensors. Having shot with cameras for years with None, or only 1 cross type sensor, I am also dubious as to the degree of their superiority.

On that note, I have not had trouble with off center AF points on any camera I use, going back to the 10D. It may be I'm not asking as much from my cameras as some.


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May 21, 2014 14:17 |  #40

I think it is only a matter of technological advancement AND wanting not to dilute the value of their professional products by making their more economic products just as good.

Example. I am confident that the 5DIV will have as good as or better center autofocus point sensitivity than the 6D. The 6DII will likely have a better sensitivity than the 5DIV if there is enough technological breakthrough between releases. I am sure the next generation rebel series still won't have as good a system as the 6D.

Trench301 wrote in post #16920400 (external link)
"I feel the overwhelming consensus is that the 6D center AF point is one of the best ever for a Canon body"

So out of curiosity, what keeps Canon from making all of its autofocus points (beit 9,11,41,63 however many) from performing as well as the center point of the 6D? Is it a cost thing? Size thing? Processor speed? or a physical limitation of the AF system, or some other design complication?

Forgive if a stupid question, still trying to learn...


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May 21, 2014 14:20 |  #41

Scoobert wrote in post #16920307 (external link)
6d guys be like------5diii guys are a bunch of rich elitist
5d guys be like------6d guys are just full frame rebel owners

Love it! :D


Sevas Tra...

  
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May 21, 2014 14:26 |  #42

6D's AF is fine, but the 5D3 just makes everything cakewalk. 5D3 is pure luxury/joy in comparison. If you've got the money, certainly go that route. I'de rather focus with a zone, than a single point here or a single point there, just less concentration involved when using a higher end body.


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May 21, 2014 14:27 |  #43

Trench301 wrote in post #16920400 (external link)
"I feel the overwhelming consensus is that the 6D center AF point is one of the best ever for a Canon body"

So out of curiosity, what keeps Canon from making all of its autofocus points (beit 9,11,41,63 however many) from performing as well as the center point of the 6D? Is it a cost thing? Size thing? Processor speed? or a physical limitation of the AF system, or some other design complication?

Forgive if a stupid question, still trying to learn...

There's probably a huge number of reasons.

To some part, cost might be involved.
And they need processing power for situations where many focus points are active at the same time.
And it's a question of product differentiation.

But a big issue with off-center focus points is that their behaviour depends a bit on what lens is used - and what zoom level the lens is used with. Any focus point that is off-center has to handle a situation with asymmetrical light from top/bottom or left/right of lens. And all lenses doesn't behave exactly the same. And the problem gets worse with a full-frame body since you then wants the outer focus points further apart.

Because of the above, the off-center points are normally not as exact as the center point. Which means isn't meaningful to implement dual-cross high-precision off-center pointers in case the actual software that will have to analyze the data and try to compensate for the lens behaviour isn't up to the task.

Canon has released a bit of information about the work they had to go through to get the 70D sensor-based phase-detect focus work as well as possible with a large number of lenses. And that was for a situation where the image sensor was used for phase-detect AF - so without the calibration errors that exists with a separate phase-detect sensor. It doesn't get easier when working with stand-alone sensor + extra mirror.

So in the end - Canon should be able to release bodies with all-cross AF, and with extra ISO sensitivity for all AF points. But Canon aren't really interested into investing a huge amount of time to try to make off-center AF points high-precision for anything but a top-of-the-line body. And even then, they know they will not manage fully but would actually need to introduce different micro-focus-adjust for different focus points.


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May 21, 2014 14:36 |  #44

CyberDyneSystems wrote in post #16920422 (external link)
Having shot with cameras for years with None, or only 1 cross type sensor, I am also dubious as to the degree of their superiority.

The focus precision depends on the angle of the contrasting area that the AF point can work with. So it isn't just a question of "will lock" or "will not lock". A cross will have better worst-case focus precision. And a dual-cross will have even better worst-case focus precision.

But the need for the extra precision depends a lot on how much shooting that is done with very fast lenses where focus precision requirements are huge while shooting in less contrasty situations where the focus point gets less data to work with.

So the actual needs varies a lot between different photographers in which case it isn't unreasonable if Canon wants more money for a camera that can fulfill more peoples requirements in more varying situations.


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May 21, 2014 15:42 |  #45

I used to own the 5D2 and I have the 6D now.

I also dabbled in the D700 for a year before coming back to Canon and getting the 6D, but IMO the 6D is the best. All the AF points are really good, but they are SO much more sensitive and catch contrast noticeably better then the 5D2.

But the BIGGEST improvement with focusing is the ability to program buttons to do other functions. THIS IS HUGE.

Currently, I have the DoF button toggled to AI-SERVO when it's pressed. What it does is, I usually shoot One-Shot for the focus confirmation beep, but if I immediately want to track something moving, I don't have to change the setting and just hold down the DoF button and it's automatically AI-SERVO AF.

If you have the newer Canon bodies that allow for programming of buttons, I HIGHLY suggest it. It's the next best thing next to back button focusing.


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