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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 02 Jan 2015 (Friday) 16:50
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Metering and AF points-MKIII

 
jeljohns
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Jan 02, 2015 16:50 |  #1

I looked all through the menu and online, but cannot find the answer to this question:

Which AF point does the 5DMKIII use when it meters? It is always the center point or does it meter where the AF point currently is.

Thanks!




  
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xpfloyd
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Jan 02, 2015 16:50 |  #2

Centre


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jeljohns
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Jan 02, 2015 17:07 |  #3

So...what if my subject is not in the center? If I meter a subject off to the side using the center, then recompose...won't that throw off my exposure if I'm in a priority mode and not manual?




  
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GeoKras1989
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Jan 02, 2015 17:22 |  #4
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In EVALUATIVE metering mode, I believe that all Canon DSLRs weight the metering toward the AF point used to obtain focus. I've had: 450D, 500D, 60D, 5Dc, 6D and two Elan 7s. All of them worked that way. It is also quite easy to use the center point for metering, hit the * button to lock the exposure, then recompose and fire the shutter. I wouldn't try that with sports/action shooting, though.


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Jan 02, 2015 17:23 as a reply to  @ jeljohns's post |  #5

depends on what you're metering off. you could meter off your subject and use exposure lock, then re-compose or use a different metering mode no?




  
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GeoKras1989
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Jan 02, 2015 17:24 |  #6
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xpfloyd wrote in post #17362704 (external link)
Centre

Not so, in EVALUATIVE mode, anyway.

Find a scene with a lot of contrast. Meter a bright spot (use AF point over the bright spot) and a meter a dark spot (use AF point over the bright spot) without moving the camera. You will get vastly different exposures.


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Jan 02, 2015 17:46 |  #7

GeoKras1989 wrote in post #17362759 (external link)
In EVALUATIVE metering mode, I believe that all Canon DSLRs weight the metering toward the AF point used to obtain focus. I've had: 450D, 500D, 60D, 5Dc, 6D and two Elan 7s. All of them worked that way. It is also quite easy to use the center point for metering, hit the * button to lock the exposure, then recompose and fire the shutter. I wouldn't try that with sports/action shooting, though.


I do not believe this to be true.

If you do a simple test with lets say a 35mm lens on a 5D3 and place a Macbook two feet from your camera with the white light shinning through the Apple Logo in Evaluative Metering, it does not matter at all if you move the focus point around all the focus points and out to the edge where it is MUCH darker than the bright white light shinning through the Apple logo - you get the same metering - thus it is not taking into affect your selected focus point - the 1Dx allows you to do this but the 5D3 (at least) does not.


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Jan 02, 2015 18:09 as a reply to  @ wallstreetoneil's post |  #8
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This is way too easy to prove to bother with any debate about it. The following two identically framed shots were taken with 60D/28 1.8 in Manual mode with auto-ISO. One is using the right AF point over the printer, the other is using the left AF point over the document on screen. NOTHING CHANGED BUT THE SELECTED AF POINT. There is a 3-stop exposure difference. How is that possible if the camera used the center point each time? Canon cameras (as far as I can tell) have always weighted the exposure toward the selected AF point. Even my film cameras did this. My 6D does the same thing. My guess is that your 5DIII behaves this way, also. BTW, EXIF intact on these shots.


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Jan 02, 2015 18:17 |  #9
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Someone help, please. I can see the EXIF on other folks' posted photos, but I can't 'view exif' on the two shots that I posted above. What gives?


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Jan 02, 2015 18:27 |  #10
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Apparently, Canon believes that Evaluative metering is linked to the selected AF points on ALL Canon cameras.

Quoted from: http://www.learn.usa.c​anon.com …ograph_snow_art​icle.shtml (external link)

"Metering Modes

Most cameras have more than one metering mode (though they all use the basic reflective approach described above). These modes are not always found in every camera, but here are some of the common ones found in the Canon EOS and PowerShot systems:

Evaluative: Metering is directly linked to, and concentrated on, the area around the active AF point, whether you’ve focused on something in the center or off-center. Light values measured at the active AF point are compared with light values measured from the metering segments across the remaining areas of the scene, and the camera's metering system attempts to provide an accurate exposure based on that comparison. This metering pattern is often effective when photographing people, but may not be quite as effective when photographing snowy landscapes depending on other elements in the scene. Note that because Evaluative Metering is linked to active AF points, focusing on a different subject may result in a very different exposure — even within the same scene. Note: In the simulated viewfinder, Evaluative mode is shown with the left-most AF point active
."


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GeoKras1989
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Jan 02, 2015 18:30 |  #11
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wallstreetoneil wrote in post #17362799 (external link)
I do not believe this to be true.

If you do a simple test with lets say a 35mm lens on a 5D3 and place a Macbook two feet from your camera with the white light shinning through the Apple Logo in Evaluative Metering, it does not matter at all if you move the focus point around all the focus points and out to the edge where it is MUCH darker than the bright white light shinning through the Apple logo - you get the same metering - thus it is not taking into affect your selected focus point - the 1Dx allows you to do this but the 5D3 (at least) does not.


Canon seems to think it does.


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Jan 02, 2015 18:38 |  #12
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A few words of explanation, if I may.

When I first switched from manual film cameras to auto-everything digital (XSi) about 6 years ago, I was hugely confused by the various ways the metering modes behaved. I grew up on Center-Weighted Average that was the only available metering mode on most SLRs in the 1970s. I figured the best way to attack the 'metering' problem was NOT to try to figure out all 4 of them, but to understand ONE of them completely. I have spent a lot of time mastering EVALUATIVE metering. I use it exclusively because I know how it works, completely. I find it much easier, no matter what the scene, to know how the camera is going to meter, and adjust EC on the fly, than switching modes every time the lighting changes. EVALUATIVE metering is much aligned for not behaving well in this or that light. It is very predictable, if you know how it supposed to work. It is the only mode I use.


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jeljohns
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Jan 02, 2015 18:38 |  #13

I would think spot metering on the AF point would make much more sense. I wonder why Canon didn't link spot metering to AF point.




  
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GeoKras1989
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Jan 02, 2015 18:41 |  #14
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jeljohns wrote in post #17362889 (external link)
I would think spot metering on the AF point would make much more sense. I wonder why Canon didn't link spot metering to AF point.

I think they did, on the high-end cameras. I don't use SPOT metering or high-end cameras, so I'll let others comment more thoroughly on that.

EDIT: If you understand how EVALUATIVE works, you have no use for SPOT metering.


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Post edited over 4 years ago by Submariner.
     
Jan 02, 2015 18:45 |  #15

jeljohns wrote in post #17362889 (external link)
I would think spot metering on the AF point would make much more sense. I wonder why Canon didn't link spot metering to AF point.

One of the major reasons to buy a 1DX.
IMO one of the few failings of the 5DIII.

Only in Evaluative Mode is the metering done at the AF Point that achieved Focus, in all other modes its done at the Centre AF point
f***king crazy!

For £3,000 I expected metering to be done at the AF point selected, or that achieved focus UNLess I set an option to chooose the centre Point.
But I was dreaming !


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Metering and AF points-MKIII
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