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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 26 Oct 2015 (Monday) 14:49
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Canon 24-70 2.8 sharpness

 
Shooting
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Oct 26, 2015 14:49 |  #1

I have had this lens for about 4 years and the problem has been here since day 1. Shooting close of just one or two people images are sharp. However when backing up for about 15 feet or more the images become not sharp at all. The further back the blurrier and I focus on someone in the front row. Like in this image, the back wall is more in focus which makes me think the further back I get the more the middle focusing point is changing to focus on the back, is that possible? as on this one, I focused on the brides face. I took 3 pictures focusing on #1 bride, #2 groom and #3 woman in the back to the bride's left shoulder and all 3 have the very same result and I did use a tripod. Should I try to focus on a bigger body part like the torso the further back I go? I shot this with a Canon T5I and it doesn't have AF focus adjustment. Before then I shot with a 50D with it and did the adjustment but with negligible results.

Any one got any solutions? Can't really afford to send it to Canon but I'll get the money some way if I have to if it will do any good.


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Oct 29, 2015 15:02 |  #2

I guess no one has this problem or any suggestions.




  
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Oct 29, 2015 15:19 |  #3

Honestly the image as hosted by the forum is so small that I can't see the issues. The following might help:

Post a full-size image somewhere else like Flickr and put a link here.

If you're shooting Raw, post the original OOC image so that the EXIF data including focus point is accessible.

Were you shooting single point, zone, or ?

It's possible that the focus point locked on the wrong subject, but we can't tell without knowing where the camera thought it was focusing. It's also possible that focus offset is severe enough that the camera is back-focusing, but without the focus point info that is just speculation. At f/4.5 you've got just enough DOF to cover the group, but only if the focus point is in the right place.


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Oct 29, 2015 15:30 |  #4

So you used a single focus point and focused on the bride? Did you focus and recompose? Do you use the custom function to allow you to focus with the * button on the back allowing you to fix your focus and using the shutter button for shooting the picture/

Also agree that the image is rather small to get any idea of where the focus hit.


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Oct 29, 2015 17:00 as a reply to  @ Chet's post |  #5

Yes single focus point. Did not focus and recompose, I always compose first. Yes on custom to use * for back button focusing. Also tried shutter button, same result. I tried to upload a bigger pic but this system will not let me.

Also I tried zooming in to 70mm and focusing, zooming back out to 24mm, no change. Even at 70mm if I am about 15 or more feet away, it does no good.

https://www.dropbox.co​m …8lxkrs6/IMG_011​8.CR2?dl=0 (external link)

This link should work.




  
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Oct 29, 2015 17:31 |  #6

GregDunn wrote in post #17764727 (external link)
Honestly the image as hosted by the forum is so small that I can't see the issues. The following might help:

Post a full-size image somewhere else like Flickr and put a link here.

If you're shooting Raw, post the original OOC image so that the EXIF data including focus point is accessible.

Were you shooting single point, zone, or ?

It's possible that the focus point locked on the wrong subject, but we can't tell without knowing where the camera thought it was focusing. It's also possible that focus offset is severe enough that the camera is back-focusing, but without the focus point info that is just speculation. At f/4.5 you've got just enough DOF to cover the group, but only if the focus point is in the right place.

Even though I focused on the bride in the front row the back row is in focus better. I tried on a tree trunk while ago with worse results. I was about 20 ft away shooting at 70mm and it is pretty fuzzy, went out to 24mm and the entire thing is fuzzy.




  
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Oct 30, 2015 11:21 |  #7

At 24mm and f4.5, it should have enough DOF to cover the whole group in the picture. It could be that the lens is out of spec of some sort.

Is it consistently blurry even outside in good light too? Try to play with Micro Adjustment to see if it helps, if not, it may need a trip to Canon.


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Oct 30, 2015 18:56 as a reply to  @ sonnyc's post |  #8

Yes, it is so consistent I can rely on it to be fuzzy in bright light as well. No matter what the light - 24mm is the worse. My camera doesn't have a micro adjustment. I used to have a 50D and tried the micro adjustment on it and that did not help. I just sent it off today to Canon. From what I've read, that usually does no good - either Canon says there is nothing wrong with it or whatever the person pays for doesn't get fixed even though Canon collected the money. So we'll see.

If they do not fix it or say they do and it doesn't work like it should, it is going on ebay and I'm going prime. And not canon prime either.




  
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Nov 03, 2015 17:22 as a reply to  @ Shooting's post |  #9

Canon sent me the estimate. $299.98 and should take 5 to 7 business days. They said that the lens has a 6 month warranty now. If it isn't fixed or goes Rogue again in that time it is going back without hesitation.




  
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Nov 04, 2015 05:25 |  #10

Not a bad outcome so far. After reading a Lensrental teardown of this lens I wouldn't be surprised if it was just wear and tear that was causing your problems. Hopefully it returns in top shape


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Nov 11, 2015 14:07 as a reply to  @ smythie's post |  #11


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Not fixed, just got it back today. This is a 100% crop from 24ft away. ISO 400 1/80 at f/8.0 Should I send it back again or just sell the thing.



  
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Nov 11, 2015 14:15 as a reply to  @ Shooting's post |  #12

Really stupid question, the mf/af switch is on af, correct? And you've tried on both of your bodies?


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Nov 11, 2015 14:31 as a reply to  @ Chet's post |  #13

Not stupid. Yep it is on AF. The closer I get to a subject the more in focus and clear it gets. I tried it on 3 bodies. Canon is sending me a return shipping label so they can try it again (sigh).




  
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Post edited over 4 years ago by Xyclopx.
     
Nov 11, 2015 15:10 |  #14

quick test for you k?

mount on tripod and MANUALLY focus using live view 10x mag. then take the shot and report.

if it's still soft your lens is physically out of whack. if it's good, then either you need to microadjust or you are just not using AF correctly.


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Nov 11, 2015 16:22 as a reply to  @ Xyclopx's post |  #15

Humm..well, I tried it on two of the same bodies, one was a little better than the other but nothing to brag about. Neither of them was as bad as the examples I posted. I went outside and took the same picture with both T5i's and one was as fuzzy as the one posted and the other was clearer and not as bad. So getting mixed results. I tried back button focusing and shutter focusing - One shot focusing mode. Focusing on the same subject, same eye, same exposure and yet one is better than the other. Could it now be a camera thing. The T5i's do not have micro adjustment. Canon's paperwork said they replaced 3 internal collars.




  
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