December 18, 2014, 07:53:15 PM

Author Topic: 6D autofocus capabilites: let's bust some myths about it  (Read 65365 times)

sanj

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #255 on: April 19, 2014, 09:20:48 AM »
"many of us know that focus/recompose causes problems with fast lenses shot wide open.  If you're using a slower lens, stopping down your fast lens, or aren't a stickler for critical focus on your intended subject, focus/recompose can work."

One learns this within months of starting to learn photography.

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #255 on: April 19, 2014, 09:20:48 AM »

sanj

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #256 on: April 19, 2014, 09:23:09 AM »
I have both the 6D as well as the 5D3. I've tried and did not like using the 50L or the 85L II on the 6D except when I was shooting with a tripod and LV. The positioning of the AF points on the 6D is such that lots of focus-recompose is needed and with the 50L and 85L II, it's just asking for trouble.

While it is true you are more limited with your AF points on the 6D, keep in mind you can focus and crop instead of recompose.

More importantly, the 6D allows for easy switch to Eg-S focus screen unlike the 5D3 - so IMO 6D actually has a significant advantage for manually focusing the f/1.2 lenses and seeing their true DOF in the viewfinder.  One could argue you are looking for trouble in general if you try to autofocus at f/1.2 all the time no matter what camera you use.

Does not sound like a great idea to me.

bdunbar79

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #257 on: April 19, 2014, 09:29:19 AM »
Which is the whole point.  With the 5D3/1Dx/1D4/1Ds3 etc., you don't have to use focus/recompose.  Focus/recompose sucks hardcore.
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neuroanatomist

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #258 on: April 19, 2014, 10:41:06 AM »
Which is the whole point.  With the 5D3/1Dx/1D4/1Ds3 etc., you don't have to use focus/recompose.  Focus/recompose sucks hardcore.

Unless you're the mythical SuperCarl, who's X-ray vision allows him to see through facts as if they aren't even there, and who's powerful lungs can blow hot air all day long.  SuperCarl, who can bend felt with his bare hands, leap tall golfballs in a single bound, and has a 6D that defies the principles of geometry and optical physics. 
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Dylan777

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #259 on: April 19, 2014, 10:51:37 AM »
Which is the whole point.  With the 5D3/1Dx/1D4/1Ds3 etc., you don't have to use focus/recompose.  Focus/recompose sucks hardcore.

Unless you're the mythical SuperCarl, who's X-ray vision allows him to see through facts as if they aren't even there, and who's powerful lungs can blow hot air all day long.  SuperCarl, who can bend felt with his bare hands, leap tall golfballs in a single bound, and has a 6D that defies the principles of geometry and optical physics.

Neuro, have you come up the title for this poem yet? I'm guessing "SuperCarl" ;D
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3kramd5

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #260 on: April 19, 2014, 11:13:06 AM »
ken rockwell says the 6d af is better than the 5diii which is too complicated. the 6d af doesn't get in the way, it just works baby!

After all, you can AF at LV-3 with the center point, then recompose on your tripod, and get a nice, steady image of an OOF subject. Can't possibly do that with a 5D.
« Last Edit: April 19, 2014, 11:29:17 AM by 3kramd5 »
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bdunbar79

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #261 on: April 19, 2014, 12:04:30 PM »
Additionally, he adds in that the 1Dx and 5D3 would have never AF'd in a particular situation that the 6D did.  He also makes the accusation that we've never shot with the 6D so how can we comment?

1.  The 1Dx and 5D3 would have easily AF'd in that case, so that point right there is simply objectively WRONG.
2.  He hasn't shot with the 1Dx or 5D3, yet makes the above comment.  Talk about the pot calling the kettle black. 

Is he for real?  There's NO WAY any sane person could both make the arguments he's making and simultaneously believe in those arguments.

The AF system of the 1Dx is best = $6799
The AF system of the 5D3 is second best = $3399
The AF system of the 6D is the "least good" out of all 3 = $2000 ish

Hmm, surprising!
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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #261 on: April 19, 2014, 12:04:30 PM »

3kramd5

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #262 on: April 19, 2014, 12:40:54 PM »
Additionally, he adds in that the 1Dx and 5D3 would have never AF'd in a particular situation that the 6D did.  He also makes the accusation that we've never shot with the 6D so how can we comment?

1.  The 1Dx and 5D3 would have easily AF'd in that case, so that point right there is simply objectively WRONG.
2.  He hasn't shot with the 1Dx or 5D3, yet makes the above comment.  Talk about the pot calling the kettle black. 

Is he for real?  There's NO WAY any sane person could both make the arguments he's making and simultaneously believe in those arguments.

The AF system of the 1Dx is best = $6799
The AF system of the 5D3 is second best = $3399
The AF system of the 6D is the "least good" out of all 3 = $2000 ish

Hmm, surprising!

It's just silliness. The 6D is a nice, affordable 135 format DSLR. It has some nice features, but AF is hardly its selling point. -3LV autofocus, as has been pointed out, has some significant practicality issues.
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ashmadux

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #263 on: April 19, 2014, 05:51:01 PM »
Focus and crop...sounds like foolishness.
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bholliman

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #264 on: April 19, 2014, 07:25:09 PM »
That's very similar to my experience the 5DII, although the hit rate dropped noticeably when the subject was moving toward/away from the camera, or when trying to track moving subjects in lower light.  For example, kids coming down a slide at an indoor 'bouncy house' (4-6 EV lighting), the 6D I had borrowed locked on initially at the top, but couldn't keep up with tracking.  My 1D X tracks the whole way down, either following the kid with the center point, or using auto point selection and letting the system hand off focus from one AF point to the next. 

Yeah, the 6D doesn't handle subjects moving towards or away well at all, especially towards, probably more noticeable due to the shallower DOF.  Side to side is OK. 

I'll have to rent a 1Dx sometime to see what it can do.

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johnf3f

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #265 on: April 19, 2014, 08:38:48 PM »
 [/quote]

Yeah, the 6D doesn't handle subjects moving towards or away well at all, especially towards, probably more noticeable due to the shallower DOF.  Side to side is OK. 

I'll have to rent a 1Dx sometime to see what it can do.
[/quote]

DON'T - you will end up buying one!!! ;D

sanj

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #266 on: April 20, 2014, 12:06:01 AM »
Can someone please explain dumb me what does focus at "-3ev" actually mean? Thanking in advance.

3kramd5

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #267 on: April 20, 2014, 12:33:24 AM »



Can someone please explain dumb me what does focus at "-3ev" actually mean? Thanking in advance.

Exposure values were initially used to merely compare exposure settings, and settings independent of film speed. EV0 was defined as 1sec at f/1. In this context, it is assumed to be at 100ISO (ISO100, aka light value). EV0 light would require f/1 at 100 for 1 second or equivalent to properly expose. EV-3 is three stops darker, or f/1 at 100 for 8 seconds, or f/0.7 at 200 for 2 seconds, etc. In other words, it's dark.
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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #267 on: April 20, 2014, 12:33:24 AM »

Marsu42

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #268 on: April 20, 2014, 02:22:14 AM »
Can someone please explain dumb me what does focus at "-3ev" actually mean? Thanking in advance.

Note that phase af always works with open aperture, i.e. your camera will need more LV with a slow f5.6 lens than with a fast f1.4 one to still be able to focus... one reason to get a f2.8 zoom even if you seldom actually take pictures @f2.8 and are ok to carry the bulk/weight + pay for it.

http://www.kenrockwell.com/tech/ev.htm

CarlTN

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #269 on: April 20, 2014, 03:24:07 AM »
Additionally, he adds in that the 1Dx and 5D3 would have never AF'd in a particular situation that the 6D did.  He also makes the accusation that we've never shot with the 6D so how can we comment?

1.  The 1Dx and 5D3 would have easily AF'd in that case, so that point right there is simply objectively WRONG.
2.  He hasn't shot with the 1Dx or 5D3, yet makes the above comment.  Talk about the pot calling the kettle black. 

Is he for real?  There's NO WAY any sane person could both make the arguments he's making and simultaneously believe in those arguments.

The AF system of the 1Dx is best = $6799
The AF system of the 5D3 is second best = $3399
The AF system of the 6D is the "least good" out of all 3 = $2000 ish

Hmm, surprising!

Actually that's a lie, I have shot with both the 5D3 and 1DX.  Not with this particular lens though.  I'm not calling anybody black, but you're starting to look like you're just puking to me, so that's now your color.

Why the childish name calling, and the just plain making shi+ up as you go along?  How old are you again?
« Last Edit: April 20, 2014, 03:30:14 AM by CarlTN »

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Re: 6D autofocus capabilites: let's bust some myths about it
« Reply #269 on: April 20, 2014, 03:24:07 AM »