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Thread started 01 Jan 2017 (Sunday) 22:54
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Need help with these 6D/70-200 photos

 
Perfectly ­ Frank
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Post edited over 1 year ago by Perfectly Frank.
     
Jan 01, 2017 22:54 |  #1

I used my 6D and 70-200 f2.8 IS II at a night time parade. This camera/lens combo has always produced super-sharp images.
But almost all of my parade photos were soft - many had to be deleted.

My goal was to have a sharp subject, and with background people and objects with a pleasant blur. So I set the 6D to center-point,
one-shot AF.

Here's two examples. Both were shot at f4.0, ISO 12800.

This one at 1/160s, 110mm. The AF point was on her skirt. The second image at 1/250s, 182mm, AF point on her face.

BTW, I used this same camera and lens at the same parade two years ago, and the results were excellent.
Back then I set the 6D to AI Servo mode, this year to One-shot AF. I'm not sure if that makes any
difference, as most of my subjects were very slow moving.

Comments and suggestions are welcomed. Thanks.


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rrblint
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Jan 02, 2017 00:38 |  #2

AI Servo makes a huge difference when shooting moving objects and I would highly recommend using it under these circumstances. That said, both of these shots are sharply focused on background subjects rather than your subject in the foreground. Did you focus and recompose?


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Jan 02, 2017 00:48 |  #3

Looks like you simply missed focus on these.


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Sibil
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Jan 02, 2017 05:21 |  #4

Perfectly Frank wrote in post #18230337 (external link)
Back then I set the 6D to AI Servo mode, this year to One-shot AF. I'm not sure if that makes any
difference, as most of my subjects were very slow moving.

In my experience, it does make a difference, even with slow moving subjects.




  
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Perfectly ­ Frank
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Jan 02, 2017 09:40 |  #5

rrblint wrote in post #18230384 (external link)
AI Servo makes a huge difference when shooting moving objects and I would highly recommend using it under these circumstances. That said, both of these shots are sharply focused on background subjects rather than your subject in the foreground. Did you focus and recompose?

No, I did not focus and recompose. Having the camera set to One-shot was a mistake on my part. I usually shoot events with AI Servo.
I forgot to check my camera settings :-(


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Perfectly ­ Frank
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Jan 02, 2017 09:49 |  #6

shaunmcfd wrote in post #18230388 (external link)
Looks like you simply missed focus on these.

Could be, but a large number of images were like this. To be honest, I don't remember paying
attention to the AF confirmation lights. Hopefully the problem is just user error.


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BigAl007
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Jan 02, 2017 10:07 |  #7

Even if the floats are moving quite slowly if you lock focus and then wait a little bit then the subject will have moved out of the focal plane, and the people behind have moved into it. You should never use one shot on a subject that is or might move, in that situation you should always use AI-Servo. The thing is that although you get the AF confirmation light, that is locked once it has achived focus in one shot, and will remain lit even if the subject moves completely ouy of focus, even if you keep the point on the subject.

Alan


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Bassat
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Jan 02, 2017 10:43 |  #8

Moving target = AI-servo.


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Perfectly ­ Frank
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Jan 02, 2017 10:52 |  #9

BigAl007 wrote in post #18230651 (external link)
Even if the floats are moving quite slowly if you lock focus and then wait a little bit then the subject will have moved out of the focal plane, and the people behind have moved into it. You should never use one shot on a subject that is or might move, in that situation you should always use AI-Servo. The thing is that although you get the AF confirmation light, that is locked once it has achived focus in one shot, and will remain lit even if the subject moves completely ouy of focus, even if you keep the point on the subject.

Alan

Thanks, Alan. Your last sentence is very important and some thing I have not considered.

Ok, here's what I've learned from my blunder...

Thoroughly check all camera and lens settings.
Take some test shots before the event begins.
Occasionally check images on the LCD.
Review the camera/lens manual as needed.


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Perfectly ­ Frank
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Jan 02, 2017 10:53 |  #10

Bassat wrote in post #18230681 (external link)
Moving target = AI-servo.

Right on!

I was aware of that but didn't check my camera settings. Bummer :cry:


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Jan 02, 2017 11:07 |  #11

I don't see a listing of which AF group you were using here (center/single point, Zone or All af points); with crowds like that, using single/center point, along with Servo will be your friend. First shot, focus is firmly on the store front to the rear and the second, it's on the woman at the extreme, right edge of the frame. That sort of variety is usually from letting the camera decide where to grab focus instead of specifying it yourself.


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Bassat
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Post edited over 1 year ago by Bassat.
     
Jan 02, 2017 13:24 |  #12

Perfectly Frank wrote in post #18230691 (external link)
Right on!

I was aware of that but didn't check my camera settings. Bummer :cry:

IF you set up your camera properly, you don't need to move it from your eye to check. AI-Servo vs OneShot. I have my cameras set up BEEP on focus acquisition, and the DOF field button toggles AI-Servo/OneShot (works no matter which it is on when you start).

This way, if I get a beep, I know I am in OneShot. Just press/hold the DOF button and it switches to Servo. No beep? Already AI-Servo. Press/hold DOF for OneShot.


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Perfectly ­ Frank
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Jan 02, 2017 14:36 |  #13

Snydremark wrote in post #18230701 (external link)
I don't see a listing of which AF group you were using here (center/single point, Zone or All af points); with crowds like that, using single/center point, along with Servo will be your friend.

In my first post, center point AF.
There is a consensus here that using One-shot AF instead of AI Servo was my problem.


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Need help with these 6D/70-200 photos
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