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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 21 Mar 2011 (Monday) 16:49
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Is this bad focus or camera movement?

 
ncjohn
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Mar 21, 2011 16:49 |  #1

Camera movement or bad focus? In this photo, the auto-focus point is on the grey sleeve of the woman's left arm. Her arm is moving so it's blurred, but the grill of the blue car is sharper than anything else in the photo. The rear portion of the car (behind the brown horse) is pretty clear too. The brown horse looks closer (Not to mention very, very tiny!) because he's sharper than the foreground.
The aperture was 7.1 and the shutter speed was only 1/100 (My bad, Program AE, but getting the shots was more important than getting them right; they're only intended for snapshots.) But if the problem is camera movement, seems like the car and other background stuff would be as blurry as the foreground.

So is it me or the camera? (Tell me it's me, tell me it's me!:))

If someone wants to look at the RAW, it's at www.jjlittle.com/test/​img_1961.CR2 (external link).

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO



  
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shaftmaster
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Mar 21, 2011 16:55 |  #2

Probably both, but it looks more like missed-focus. You need to make sure the AF point is on something that has some contrast in order for AF to work properly. Trying to focus on a grey sleeve is probably not the best idea. You should have tried to focus on the black lettering on the gray shirt or something like that.


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Monito
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Mar 21, 2011 17:20 |  #3

Mis-focus. The horses and background are sharp.

The AF sensor area is larger than the rectangle that is shown in the viewfinder or on software. So if you tried the sleeve, the AF may have actually overlapped the horse's mane hair or possibly even the car.

1/100 sec at 57 mm equivalent (account for 35 mm x 1.6 crop focal length) is at the border of where some noticeable percentage of pictures would be unsharp due to camera shake, but in this case the sharpness of the background indicates this is not a problem with this particular photo.


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SkipD
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Mar 21, 2011 17:45 |  #4

ncjohn wrote in post #12064430 (external link)
In this photo, the auto-focus point is on the grey sleeve of the woman's left arm.

I agree with shaftmaster. Your focus target has to have some significant contrast in it for autofocus to be able to lock on to the point you've picked. A gray sleeve is about as bad a target as you could have picked.

If camera/lens motion was the culprit in a fuzzy image, everything with sharp contrasty lines would be equally fuzzy from the motion.


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cptrios
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Mar 21, 2011 19:36 |  #5

I disagree! To me it looks like the horse is rather quickly moving its head, resulting in blur. Both the background and foreground (look at the hay, the women's jeans, the left-hand woman's scrunchie, for example) are in focus. In fact, everything is in focus except for the horse's head. And there would have to be MC Escher level perspective trickery going on to make said head be close enough to the camera to render it OOF.

So yeah, it seems like the motion of the horse is at fault, not camera shake or bad focus.


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Monito
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Mar 21, 2011 19:39 |  #6

cptrios wrote in post #12065501 (external link)
it seems like the motion of the horse is at fault, not camera shake or bad focus.

Could be. The Raw image has been removed by the OP so I can't check it.


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ncjohn
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Mar 21, 2011 19:45 |  #7

Monito wrote in post #12065519 (external link)
Could be. The Raw image has been removed by the OP so I can't check it.

The RAW is still there.




  
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Monito
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Mar 21, 2011 19:47 |  #8

The link gives a microsoft server 404 Page Not Found error.


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FlyingPhotog
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Mar 21, 2011 19:49 |  #9

I think it's mostly horses head moving + 1/100 as a SS.

1/100 won't freeze motion really well. Looks like her left hand is going with the horse and her right hand is swinging forward with the momentum. Both look like motion blur to me.


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ncjohn
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Mar 21, 2011 19:57 |  #10

I updated the pic to show the AF point as DPP shows it.

My FTP program shows the file still there, but I also get the 404 when I click the link in my post. What am I doing wrong?




  
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ncjohn
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Mar 21, 2011 20:02 |  #11

cptrios wrote in post #12065501 (external link)
I disagree! To me it looks like the horse is rather quickly moving its head, resulting in blur. Both the background and foreground (look at the hay, the women's jeans, the left-hand woman's scrunchie, for example) are in focus. In fact, everything is in focus except for the horse's head.

I don't think the scrunchie looks in focus at all (or the jeans, or the shirt... actually, not much at all in the foreground. Maybe the seam on the front of the pants of the woman holding the horse.)




  
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yogestee
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Mar 21, 2011 20:19 as a reply to  @ ncjohn's post |  #12

Thge blury horsehead if due to subject movement..

I'm seeing many things here.. The brown horse in the background is quite sharp,, so is the hay in the foreground..


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shaftmaster
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Mar 21, 2011 20:56 |  #13

Hmmm, looking at this again it does seem to be subject motion instead of mis-focus. The woman in the middle and the black horse are blurry. Was the new picture with the AF point in red sharpened more than the original?


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SkipD
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Mar 21, 2011 20:58 |  #14

cptrios wrote in post #12065501 (external link)
I disagree! To me it looks like the horse is rather quickly moving its head, resulting in blur.

FlyingPhotog wrote in post #12065586 (external link)
I think it's mostly horses head moving + 1/100 as a SS.

yogestee wrote in post #12065785 (external link)
Thge blury horsehead if due to subject movement..

According to what he wrote in post #1, the OP was concerned whether or not the lack of sharpness in the image was due to focus error or camera motion. He didn't seem to be concerned about any motion of the objects in the scene. That's why I responded the way I did before in post #4.


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ncjohn
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Mar 21, 2011 21:18 |  #15

shaftmaster wrote in post #12066030 (external link)
Hmmm, looking at this again it does seem to be subject motion instead of mis-focus. The woman in the middle and the black horse are blurry. Was the new picture with the AF point in red sharpened more than the original?

No, all I did was load the jpg into irfanview and make the red square, using the RAW in DPP as a guide.




  
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Is this bad focus or camera movement?
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