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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 16 Sep 2010 (Thursday) 17:29
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Is this back focus?

 
cobra671
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Sep 16, 2010 17:29 |  #1

Hello all,

So I went around shooting random subjects today. After I got back to my hotel, I decided to go through the shots and I noticed on several of my shots, the subjects I shot were out of focus, but I'm not really sure. Maybe the forum can help me out.

This shot was of someone just snapping a quick portrait of herself. I focused on her head and this is what I got. Is this what is meant as back focus? To me, it looks like everything behind her is in focus.

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T1i
Sigma 50 1.4
Shot settings:
Manual
f2.8
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iso 100
evaluative metering


Thanks in advance for any feedback!



  
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msowsun
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Sep 16, 2010 17:31 |  #2

Looks like missed focus to me.


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Quizzical_Squirrel
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Sep 16, 2010 17:33 |  #3

You may have focussed on her head but it looks like the contrast in the white jacket behind her head was easier for the camera to lock on to.




  
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cobra671
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Sep 16, 2010 17:38 |  #4

Okay, so far it sounds like user error. I can accept that.

Thanks gents!




  
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phreeky
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Sep 16, 2010 17:45 |  #5

Yeah you've got to be careful when the subject you're focusing does not sufficiently cover your focusing point.




  
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Quizzical_Squirrel
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Sep 16, 2010 17:48 |  #6

If I'm right, I think you were just really unlucky Mr White-Jacket happened to cross right behind her head at exactly the moment you were taking the picture.




  
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cobra671
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Sep 16, 2010 17:55 |  #7

I was probably a good 20-25 yards away, so I can see how my focus point would've covered behind her too, or like QS said, and the camera locked on to the white jacket.

Lesson learned.

Thank you all!




  
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Velorium
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Sep 16, 2010 19:09 |  #8

I find that using spot metering on the center, then moving my camera seems to work best.




  
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egordon99
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Sep 16, 2010 19:33 |  #9

cobra671 wrote in post #10923024 (external link)
I was probably a good 20-25 yards away, so I can see how my focus point would've covered behind her too, or like QS said, and the camera locked on to the white jacket.

Lesson learned.

Thank you all!

This trips me up a bunch too. When shooting wide, it's hard to see in the viewfinder whether or not it locked right on the object you intended. Closeup or narrower shots, it's a bit easier. Makes you long for the old split-prism focusing-screens of yore.

It REALLY sucks when you miss a shot like this at f/1.4.




  
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cobra671
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Sep 16, 2010 21:08 |  #10

I will try spot metering tomorrow. I try not to use f1.4 too often at distances greater than 15 feet. It gets too tough for me after that.




  
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msowsun
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Sep 17, 2010 05:51 |  #11

Spot metering is for exposure. Not for focusing.


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yogestee
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Sep 17, 2010 09:10 |  #12

msowsun wrote in post #10925494 (external link)
Spot metering is for exposure. Not for focusing.

Bingo..

But,, the poster could mean only choosing one focus point..


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The Title Fairy,, off with her head!!

  
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msowsun
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Sep 17, 2010 09:28 |  #13

Velorium wrote in post #10923356 (external link)
I find that using spot metering on the center, then moving my camera seems to work best.

cobra671 wrote in post #10923893 (external link)
I will try spot metering tomorrow. I try not to use f1.4 too often at distances greater than 15 feet. It gets too tough for me after that.

yogestee wrote in post #10926204 (external link)
the poster could mean only choosing one focus point..

Two posters have now said "spot metering". I just want to make sure they (and anyone else reading this) don't get the wrong idea.

Some cameras have "Spot AF" but that is very different from "Spot Metering". The 7D has "Spot AF" but the T1i does not.


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yogestee
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Sep 17, 2010 09:47 as a reply to  @ msowsun's post |  #14

I just did a quick EXIF check with DPP..

Camera Model Canon EOS REBEL T1i
Shooting Mode Manual Exposure
Tv( Shutter Speed ) 1/250
Av( Aperture Value ) 2.8
Metering Mode Evaluative Metering
ISO Speed 100
Auto ISO Speed OFF
Lens 50mm
Focal Length 50.0mm
Image Size 1015x669
Image Quality Fine
Flash Off
FE lock OFF
White Balance Mode Auto
AF Mode One-Shot AF
Picture Style User Defined 2(Standard)

THe EXIF doesn't show if one focus point was used or where the point of focus is..


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nes_matt
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Sep 17, 2010 09:56 |  #15

msowsun wrote in post #10926299 (external link)
Two posters have now said "spot metering". I just want to make sure they (and anyone else reading this) get the wrong idea.

Some cameras have "Spot AF" but that is very different from "Spot Metering". The 7D has "Spot AF" but the T1i does not.

That's not true (unless I misunderstand what you are saying). You can choose any one or all of the 9 AF points in manual mode. And, you can do this in conjunction with spot metering just to make life interesting.

ETA: check pages 64-67 in the manual (external link). It tells you how to use the AF points.

I learned something re-reading that section I need to try. They say to use the center AF point when running the aperture in the f1.4-f2.8 range as it is more sensitive.


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Is this back focus?
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