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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 25 Nov 2011 (Friday) 16:22
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Looking for thoughts on focus accuracy

 
chugger93
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Nov 25, 2011 16:22 |  #1

Never tried this on my gear, so figured I would just for ****s and giggles. I may have done it wrong considering I didn't tripod any of this.

They seem to be ok no? :confused:

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JeffreyG
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Nov 25, 2011 16:46 |  #2

I think that chart causes more problems than it solves in general. If I suspect a focus problem with a lens, I use a different method to check.


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malla1962
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Nov 25, 2011 17:07 as a reply to  @ JeffreyG's post |  #3

If you were happy with the lens before just carry on using it these charts show problems that are not there more often than not.


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Hollywoodgt
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Nov 25, 2011 20:07 |  #4

JeffreyG wrote in post #13450675 (external link)
I think that chart causes more problems than it solves in general. If I suspect a focus problem with a lens, I use a different method to check.


And that method would be ?????


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goldboughtrue
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Nov 25, 2011 20:11 |  #5
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I don't think you can judge your lenses without having the camera be perfectly still. Try setting it on a counter and somehow angle the chart to fit the position of the camera.


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JeffreyG
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Nov 25, 2011 20:13 |  #6

Hollywoodgt wrote in post #13451404 (external link)
And that method would be ?????

Oh, I set up the camera on a tripod pointed at three cereal boxes. I make sure the lens is at least 50X the focal length from the target box in the center. I place the other two lenses a little closer and farther from the camera than the center box.

The center AF point overlays the middle cereal box, and since it is on a large, flat, high contrast surface we can expect very accurate AF performance.

Then I focus the camera with AF, click on live-view and take a 10X look at the boxes. If everything is dead on, the middle box will be sharp and the other two will be equally soft. I repeat a few times for consistancy.

This method has always worked well for me, and can be done even on a body without live-view by actually taking shots and reviewing on a computer. That's a lot more tedius though.

Do not review shots on the LCD after the fact. Live-view is not the same thing as the tiny jpeg thumbnail review shot.


My personal stuff:http://www.flickr.com/​photos/jngirbach/sets/ (external link)
I use a Canon 5DIII and a Sony A7rIII

  
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Looking for thoughts on focus accuracy
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