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DPChallenge Forums >> Hardware and Software >> Rebel and 85 mm f1.8 USM focusing problem
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Showing posts 1 - 8 of 8, (reverse)
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03/15/2005 05:11:26 PM · #1
Last Sunday I did about 80 photos at Baptizing ceremony 1/3 of which are done with the 85 mm lens and in many of them focus is on the background instead of the main subject.
Have anyone experienced this kind of problem?
Never happened with other 4 lenses I use.
03/15/2005 06:13:51 PM · #2
03/17/2005 03:38:55 PM · #3
bump
03/17/2005 04:07:19 PM · #4
are you sure you used the correct focuspoint ?

that´s the only thing that comes to mind...
03/17/2005 04:14:00 PM · #5
Originally posted by DanSig:

are you sure you used the correct focuspoint ?

that´s the only thing that comes to mind...


Of course,I have done 11,000 photos with my Rebel,only the 85 mm lens does this to me.
03/17/2005 04:39:10 PM · #6
I've got the same camera and lens. It's always worked for me. However, when shooting at the large aperature end (f1.8) the DOF is very small. So if it's not focused right where you want it, you'll notice it more than with a different lens and a higher f#. Is that what's happening to you? Or you are sure you're focusing on what you want? When I use it, I typically change to only ONE autofocusing point. Cause if I leave it on all of them, it will try to find some sort of "average" focus distance, and the DOF is too small for this to work. It then looks like what you describe, and my main point of interest is out of focus.

Hope this helps some. Good luck.

Doug
03/17/2005 09:28:09 PM · #7
Originally posted by dswebb:

I've got the same camera and lens. It's always worked for me. However, when shooting at the large aperature end (f1.8) the DOF is very small. So if it's not focused right where you want it, you'll notice it more than with a different lens and a higher f#. Is that what's happening to you? Or you are sure you're focusing on what you want? When I use it, I typically change to only ONE autofocusing point. Cause if I leave it on all of them, it will try to find some sort of "average" focus distance, and the DOF is too small for this to work. It then looks like what you describe, and my main point of interest is out of focus.

Hope this helps some. Good luck.

Doug


Thanks but, no help,I know how to use the camera and select the point'
:-) you sound like Canon customer help desk "Did you push the button half way and heard beep ?"
I'm telling you that something is wrong with that lense and if you plan to buy it be aware.

Message edited by author 2005-03-17 21:28:37.
03/17/2005 11:04:57 PM · #8
Kosta, I have used that lens on my 20D a lot. And I have had the same type of problem you describe, but not consistently. It happens for me, sometimes but not always, when I am shooting fast paced sports action in low light using AIservo focusing, mostly in Tv mode and using all focus points. In a burst of 5-6 shots sometimes half would be focused behind the subject. I just chalked it up to the conditions being too extreme to get top performance out of the lens/camera combination. For single shots with adequate light and stopped down some it always worked better. It gives very nice images when it gets the focus right.
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