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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 25 Mar 2011 (Friday) 13:15
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24-70mm 2.8L Focus Issues?

 
superNoid
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Mar 25, 2011 13:15 |  #1

Hey all,

I'm having some concerns with my 24-70 2.8L lens I bought. I read a lot about focusing issues, bad copies and having to have Canon calibrate. I'm still warming up to my new 7D and the lens but I've been shooting on other bodies/lens for nearly 2 years.

I am not a pro at all, please understand I know many of my shots may be overexposed in some cases but I'm trying to figure out my focus.

I look at pictures that others take with this lens and they are RAZOR sharp and crisp. Mine are just not like that, whether it be 2.8 or even up to F8. I've had a few decent shots but some of my favs are too soft for me. This could be 100% technique and mistakes on my part, I'd love that to be the case because I can keep practicing.

Can you look at some of these sample pics and give me some C&C and perhaps help determine if the focus is soft and this could be a bad copy? All of these were shot with zone AF on the 7D most in Av mode, a few manual. Also, how can I determine if my lens is a bad copy or might need calibration? Is there something I can do to figure this out without contacting Canon?

note : these pics are compressed versions, I do not have access to the original larger images from where I'm at. Thanks!

Soft?

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Decent?

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If its technique and I suck (lol).. any tips to get better? HELP!

Canon 7D | Canon 24-70 2.8L| Tamron 70-200 2.8 VC | Canon 50 1.8 | Canon 18-55 3.5 IS | Speedlite 430EX II | LowPro Slingshot 202AW | Manfrotto 561BHDV-1 | LCDVF | Home Strobist Setup | GoPro Hero3+ Black

  
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SuzyView
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Mar 25, 2011 13:18 |  #2

The link doesn't give EXIF information. On the first one, could you give us the settings? The 24-70 is not always wonderful at f2.8. I have a sweet spot at f4-5.6 and I do center point focusing.


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superNoid
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Mar 25, 2011 13:32 |  #3

SuzyView wrote in post #12091206 (external link)
The link doesn't give EXIF information. On the first one, could you give us the settings? The 24-70 is not always wonderful at f2.8. I have a sweet spot at f4-5.6 and I do center point focusing.

Sorry. I pulled these from my wifes FB page and it doesn't seem to retain or keep EXIF data. #3 and #5 were shot at F5.6 and the others were F2.8. Any crops were very minor. Is it just my eyes or do they all look soft to you? There seems to be lacking an overall crispness to all of them?


Canon 7D | Canon 24-70 2.8L| Tamron 70-200 2.8 VC | Canon 50 1.8 | Canon 18-55 3.5 IS | Speedlite 430EX II | LowPro Slingshot 202AW | Manfrotto 561BHDV-1 | LCDVF | Home Strobist Setup | GoPro Hero3+ Black

  
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alpharon
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Mar 25, 2011 13:42 |  #4

That last shot is pretty sharp. I think your problem is with your AF settings. The first few pictures look like you're just missing focus by a little bit. Zone AF doesn't always focus where you intend to. I would suggest you switch to Single Point AF or Spot AF and focus on your subjects eyes. Also, try to keep your shutter speed up to at least 1/125 on the long end of the zoom.


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Jardiniboy
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Mar 25, 2011 13:53 |  #5

The 7D's AF is really tricky.


The reason why it looks soft because in AF zone mode it's going to AF on the closest object.

In the first photo in looks like the grass on the bottom left is in focus.


Second photo, the gold object is in focus.

Third, it's focus on the arm/ bag strap.

Fourth, the bottom of the tree looks in focus.


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Tommydigi
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Mar 25, 2011 14:02 |  #6

Most certainly user error. Try using center point to be sure but in every photo something is in focus so I doubt its the lens.


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superNoid
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Mar 25, 2011 15:22 as a reply to  @ Tommydigi's post |  #7

Thanks so much for the comments, I was kind of hoping this was user error more than hardware so thats good to hear. Advice wise I will certainly stop using Zone AF for the time being and see how that changes things. I suppose I figured that was best. Looking at the shots I can see the focus in other areas like you are mentioning, strange because Zone AF (when half depressed) was indicating it was going to focus on the face/eyes of the subjects.

Is that not the case in zone af mode? If I half press the shutter and it highlights 3 AF points in a zone and they're on the subjects face... is it working correctly if it then instead focuses on the closest object? (ie the sword or the backpack?)

Either way I will do some tests with Spot or Single/center AF and see how that changes things. Thanks!

edit. I'll also play within F4-8 and see if I can find a sweet spot for focus.


Canon 7D | Canon 24-70 2.8L| Tamron 70-200 2.8 VC | Canon 50 1.8 | Canon 18-55 3.5 IS | Speedlite 430EX II | LowPro Slingshot 202AW | Manfrotto 561BHDV-1 | LCDVF | Home Strobist Setup | GoPro Hero3+ Black

  
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Tommydigi
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Mar 25, 2011 15:47 |  #8

I find mine is good at 2.8 but even just stopping down to 3.2 makes it a bit sharper and by F4 its razor sharp. Even wide open you should get great results.


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Sdiver2489
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Mar 25, 2011 15:53 |  #9

superNoid wrote in post #12092006 (external link)
Thanks so much for the comments, I was kind of hoping this was user error more than hardware so thats good to hear. Advice wise I will certainly stop using Zone AF for the time being and see how that changes things. I suppose I figured that was best. Looking at the shots I can see the focus in other areas like you are mentioning, strange because Zone AF (when half depressed) was indicating it was going to focus on the face/eyes of the subjects.

Is that not the case in zone af mode? If I half press the shutter and it highlights 3 AF points in a zone and they're on the subjects face... is it working correctly if it then instead focuses on the closest object? (ie the sword or the backpack?)

Either way I will do some tests with Spot or Single/center AF and see how that changes things. Thanks!

edit. I'll also play within F4-8 and see if I can find a sweet spot for focus.

In indicates areas of "acceptable" focus from what I've seen, not only areas in perfect focus. Definitely use a single point when you care about EXACT focus.

All your images look pretty good though even if the focus is a little off.


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superNoid
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Mar 25, 2011 15:57 |  #10

Tommydigi wrote in post #12092174 (external link)
I find mine is good at 2.8 but even just stopping down to 3.2 makes it a bit sharper and by F4 its razor sharp. Even wide open you should get great results.

I'll run some more tests this weekend and see how things go. Thanks


Canon 7D | Canon 24-70 2.8L| Tamron 70-200 2.8 VC | Canon 50 1.8 | Canon 18-55 3.5 IS | Speedlite 430EX II | LowPro Slingshot 202AW | Manfrotto 561BHDV-1 | LCDVF | Home Strobist Setup | GoPro Hero3+ Black

  
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newporthomie
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Mar 25, 2011 16:11 |  #11

superNoid wrote in post #12091189 (external link)
Hey all,

I'm having some concerns with my 24-70 2.8L lens I bought. I read a lot about focusing issues, bad copies and having to have Canon calibrate. I'm still warming up to my new 7D and the lens but I've been shooting on other bodies/lens for nearly 2 years.

I am not a pro at all, please understand I know many of my shots may be overexposed in some cases but I'm trying to figure out my focus.

I look at pictures that others take with this lens and they are RAZOR sharp and crisp. Mine are just not like that, whether it be 2.8 or even up to F8. I've had a few decent shots but some of my favs are too soft for me. This could be 100% technique and mistakes on my part, I'd love that to be the case because I can keep practicing.

Can you look at some of these sample pics and give me some C&C and perhaps help determine if the focus is soft and this could be a bad copy? All of these were shot with zone AF on the 7D most in Av mode, a few manual. Also, how can I determine if my lens is a bad copy or might need calibration? Is there something I can do to figure this out without contacting Canon?

note : these pics are compressed versions, I do not have access to the original larger images from where I'm at. Thanks!

it is pretty sharp - just do your processing

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on the 2nd you got focus at his hands



  
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newporthomie
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Mar 25, 2011 16:39 |  #12

here's another one


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and


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jckaphotography
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Mar 25, 2011 16:57 |  #13

That sharpening doesnt look good. My 24-70 miss focuses badly. Whether its on the tripod or not. There are a few threads on here talking about this issue.


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xarqi
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Mar 25, 2011 19:46 |  #14

newport_beach wrote in post #12092341 (external link)
it is pretty sharp - just do your processing

Ouch!

OP - is any filter in use on the lens? If so, try taking it off.




  
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mrmarks
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Mar 25, 2011 19:53 |  #15

Use the center AF point and try again. Hope you can post some photos here using the center AF point.




  
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