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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 01 Mar 2012 (Thursday) 22:22
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OFFICIAL: Canon 5D Mark III Announced

 
Scatterbrained
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Mar 19, 2012 14:33 |  #3796

x_tan wrote in post #14109945 (external link)
Canon EOS 5D Mark III And Lenses And AF Points from Canon HK (external link)

Print it out as the page might disappear later...

Is this what you guys are looking for? ^ http://www.canon.com.h​k …tProductTag.do?​tagID=4538 (external link)

vipergts831 wrote in post #14114041 (external link)
GMCPhotographics could you plot out the spread of the 15 point and 9 point options of the 5dmkIII on the charts below? This would help us understand the spread. Thanks!


From DP Review:

F2.8 or brighter

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F2.8 - F4

IMAGE NOT FOUND
HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO


F5.6 or brighter

IMAGE NOT FOUND
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Yohan Pamudji wrote in post #14114059 (external link)
If you're replying to me and ben, that's not quite what we were talking about. When you go into 15-point or 9-point selection modes, which of the points are selectable? Those are the diagrams we're wondering about.


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krb
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Mar 19, 2012 16:29 |  #3797

Scatterbrained wrote in post #14114261 (external link)
Is this what you guys are looking for? ^

For those who are not familiar with cameras that have a large number of AF points, it is common for such cameras to include a custom function that makes most of those points non-selectable. If you often use single AF points in either corner and rarely use AF points in between then it's nice to be able to step through only a couple points rather than slogging through 10 or 15 points that you never use.

The user manual says that the 5DmkIII allows for the number of selectable points to be reduced to 15 or nine. What the user manual does not tell us is which 15 (or 9) points those are. If the 9 points are the center point, the extreme center points up, down, left and right from the center, and then the four extreme corners then that would be a very useful pattern for most people. If the 9 points are all clustered in the center then fewer people will find it useful.


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kcbrown
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Mar 19, 2012 16:37 |  #3798

Yohan Pamudji wrote in post #14114069 (external link)
The outer points are at or slightly beyond the rule of thirds intersections. Realistically how often does one need to focus on something further out than that?

I've found it's not that uncommon at all, actually.


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trale
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Mar 19, 2012 17:01 |  #3799

kcbrown wrote in post #14114928 (external link)
I've found it's not that uncommon at all, actually.

It's just one of the inherent limitations of all phase detect AF systems that all the focusing must be confined near the center of the frame. I forgot what exactly the details of that is.

A completely different AF technology will need to be used/developed if you want AF further out. We have one alternative for now - contrast detect AF, which has its inherent limitation of being a lot slower.




  
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TheDeepThought42
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Mar 19, 2012 17:06 |  #3800

ilumo wrote in post #14114099 (external link)
you think that's disappointing? look at Nikons. Only the center 20% are cross types.

QUOTED IMAGE

I think that canon has really done a good job with expanding the AF points this time around. I can't wait to shoot without having to focus-recompose.

Does anyone know how the spread of the Canon AF points compares to the Nikon AF? ie, can someone do an overlay of the two to see the difference of how each one spreads?




  
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Yohan ­ Pamudji
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Mar 19, 2012 17:24 |  #3801

trale wrote in post #14115032 (external link)
It's just one of the inherent limitations of all phase detect AF systems that all the focusing must be confined near the center of the frame. I forgot what exactly the details of that is.

Something about how different wavelengths (colors) of light are bent different amounts, with differences being more pronounced around the edges of the lens. I think. Could be completely wrong.

A completely different AF technology will need to be used/developed if you want AF further out. We have one alternative for now - contrast detect AF, which has its inherent limitation of being a lot slower.

CDAF is only "a lot" slower in continuous AF. Single shot AF is very fast with current gen CDAF. For work where AF performance is critical regardless of light conditions and moving subjects, PDAF is still king, but if you haven't tried a fast focusing CDAF camera you'd be surprised by just how quick it is.




  
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trale
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Mar 19, 2012 18:27 |  #3802

Yohan Pamudji wrote in post #14115121 (external link)
Something about how different wavelengths (colors) of light are bent different amounts, with differences being more pronounced around the edges of the lens. I think. Could be completely wrong.

CDAF is only "a lot" slower in continuous AF. Single shot AF is very fast with current gen CDAF. For work where AF performance is critical regardless of light conditions and moving subjects, PDAF is still king, but if you haven't tried a fast focusing CDAF camera you'd be surprised by just how quick it is.

Can you point out some examples of current cameras with the fastest CDAF available today? I'll look them up.

I know this is definitely one feature that canon lags behind its competitors (G1X for example). Makes me wonder why that is the case.




  
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Mar 19, 2012 18:29 |  #3803

Right now Oly is making that claim with the OM-D.


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GMCPhotographics
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Mar 19, 2012 18:54 |  #3804

vipergts831 wrote in post #14114041 (external link)
GMCPhotographics could you plot out the spread of the 15 point and 9 point options of the 5dmkIII on the charts below? This would help us understand the spread. Thanks!

Sure no probs:


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Yohan ­ Pamudji
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Mar 19, 2012 19:20 |  #3805

GMCPhotographics wrote in post #14115569 (external link)
Sure no probs:

Much obliged! But you didn't use the diagram with all the cross-type points plotted out. You made me scroll all the way back up the page!

Man, I'm lazy :lol:




  
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Yohan ­ Pamudji
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Mar 19, 2012 19:22 |  #3806

trale wrote in post #14115440 (external link)
Can you point out some examples of current cameras with the fastest CDAF available today? I'll look them up.

I know this is definitely one feature that canon lags behind its competitors (G1X for example). Makes me wonder why that is the case.

About to send you a PM so as not to get the thread too off track. The mods be itchy already ;)




  
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Mar 19, 2012 19:22 as a reply to  @ Yohan Pamudji's post |  #3807

First video comparison:

http://vimeo.com/38652​476 (external link)


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Mar 19, 2012 19:24 |  #3808

GMCPhotographics wrote in post #14115569 (external link)
Sure no probs:

Thanks. The 15 point layout looks like what I would choose.


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Mar 19, 2012 19:26 |  #3809

krb wrote in post #14115731 (external link)
Thanks. The 15 point layout looks like what I would choose.

Looks like the middle rows aren't crosstype if I am seeing things correctly.
The 9 pt layout on the other hand contains all crosstypes right?




  
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Mar 19, 2012 19:29 |  #3810

Mike55 wrote in post #14115721 (external link)
First video comparison:

http://vimeo.com/38652​476 (external link)

Some of it does seem like the 5d II was better, but some looked like the 5d III was better, nothing dramatic though, especially at 12,800 I was surprised how well the 5D II did in comparison. I hope I will have mine this week and I will know what I think for sure.


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