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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 06 Jul 2013 (Saturday) 12:20
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Red Focus Point Box Problem

 
samefly
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Jul 06, 2013 12:20 |  #1

Gear: Canon 60D and various lenses

Problem: I recently turned on the "enable AF point display." I look through the view finder to choose my point of focus, using the red square, and take my picture. When I review the image the red square is always above where I placed it through the viewfinder. For example: I place the red square on the iris and upon review the red square indicator will show as if I focused on the top of the eye lid.

To further test this I put the body on a tripod, shot tethered using the eos utility software (for some reason lightroom 4 will not recognize my camera), used ample light, and aimed at a line on a sheet of paper. Every time it showed as if my point of focus was above the line. I tried with multiple lenses all with the same result.

Has anyone heard of this? Any solutions?


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gjl711
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Jul 06, 2013 12:28 |  #2

Sounds like your focus screen is slightly off from where the software thinks it is. In any case, teh red box is more or less an indicator of where the focus point is. The points themselves are a bit larger than the red box


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hollis_f
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Jul 07, 2013 06:33 |  #3

So, either your viewfinder, or your software is wrong. I'd have a play and see which it is.

I like to use a window frame for this sort of thing. Set your camera up on a tripod, focusing outside through the window, with the horizontal part of the bottom of the window pane just bleow the focus point rectangle. Take a shot, check the outside is in focus, point the camera lower, take another shot, repeat until focus shifts to the window frame.

Repeat for upper, left and right limits.


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number ­ six
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Jul 07, 2013 16:30 |  #4

hollis_f wrote in post #16098299 (external link)
So, either your viewfinder, or your software is wrong. I'd have a play and see which it is.

Agree with Frank. The window frame is a good idea. There are two things to check: the centering of the focus box and the size of it (most Canons are said to have a larger in-focus area than the box shows).

I did some careful tests when I got my then-new 50D, shooting through an open window:

http://strappe.smugmug​.com …h#!i=1207878848​&k=T8RTbgf (external link)

I was surprised to find the focus box was just about exactly the size of the indicated focus box in ZoomBrowser and also the same as the actual focus area of the 50D.


EDIT: BTW, if you find the focus box in the 60D is not centered on the actual focus area of the camera your SI plate is out of position. (If the 60D has an SI plate as earlier non-rebels did, that is.)

If that's the case it's time for a trip to Canon repair.


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Wilt
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Jul 11, 2013 16:52 |  #5

Are you 1) focusing, and then 2) shifting frame slightly to take shot?

If so, the red illuminated focus point shown in software indicates WHICH CAMERA FOCUS POINT, not the location upon the subject at which you focused!


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Red Focus Point Box Problem
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