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Thread started 02 Aug 2008 (Saturday) 01:09
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5D focusing issue

 
marions
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Aug 02, 2008 01:09 |  #1

When focusing on a subject my 5D seems to be focusing on the forground subject is soft forground sharp.

this is with a 24-105 and 70-200mm 2.8 L IS lens

any suggestions before I send it in to Canon?




  
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Hermeto
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Aug 02, 2008 01:35 |  #2
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Do the focus test.

http://focustestchart.​com/chart.html (external link)


What we see depends mainly on what we look for.

  
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definchdds
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Aug 02, 2008 10:45 as a reply to  @ Hermeto's post |  #3

I'd recommend using only the center focusing point as a starter. New glasses is the next step. LOL;)


Regards,
Don
:eyes 5D, 40D, "L" glass, and lots of other stuff.

  
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Wilt
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Aug 03, 2008 09:36 |  #4

Test focus on real subjects, not a test chart at 45 degree plane! It is simple to align your camera parallel to a row of books which are staggered back progressively a uniform distance on the shelf, or to a line of batteries (all in a manner like an echelon). Here is a hastily shot photo as an example of the concept, but not a real carefully done actual focus test.

IMAGE: http://i69.photobucket.com/albums/i63/wiltonw/IMG_0767-1.jpg

Now, do take notice that in this example, the leftmost Zagat guide is 3.5" behind the Bay Area Backroads and in spite of that, one cannot see super obvious out-of-focus books in the line-up, simply because the fact that the DOF at this shooting distance (48") and FL (55mm) and aperture (f/2.8 ) is 1.6" deep! If it looks well focused on normal subjects, forget the test charts. (I know, the small posting size masks out of focus books, but I hope you get my point about real world testing.)

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GTBaker
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Aug 03, 2008 09:46 as a reply to  @ Wilt's post |  #5

I'm currently emailing back 'n' forth with Canon Canada with my 40D and 70-200mm 2.8L Non-IS. I'm having focus issues with either the lense or body. I suspect the lense as my other lenses are fine.

I made this simple do-hickey to test my focus. 3 nails on a angle eqi-distance apart.

IMAGE: http://farm4.static.flickr.com/3214/2712076434_004e196a78_b.jpg

flickr (external link)
6D | 70-200 2.8 L | 300 IS L | Extension Tube EF 12 II | Stealth Reporter D650 BAG(LOWEPRO JUNK) | Manfrotto 322RC2 Grip | Carbon Fibre Tripod

  
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Luke ­ Cern
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Aug 03, 2008 12:40 |  #6

Neither Marions or GTBaker mention how you are managing depth of field. GTBaker's depth of field could be an example of image taking at f/4. The idea of using your excellent 70-200mm at f/2.8 is to achieve exactly what you are experiencing. Shallow depth of field and lovely background blur (aka bokey). It would be helpful if the EXIF (camera settings) data was included with the problem description.

The bookshelf idea is very good as is the focus chart described by Hermeto. Print it out and paste it to a rigid board so that you can experiment with the depth of field of different lenses. That way you will be able to predict what will be in focus when you out and about.


______________
Torquay Devon UK
5D MkII , 300mm f/4 L IS, 135mm f/2.0 L, , 24-105 L IS, 180mm Sigma Macro, 100mm f/2.8 Macro, 15mm Fisheye, Sigma 12-24mm f/4.5-5.6, TC, Gitzo G1298 Basalt. 580EX MKII, 430EX, ST-E2.

  
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5D focusing issue
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