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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 27 Nov 2013 (Wednesday) 18:53
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24-70mm f2.8 II focus

 
b7a4
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Nov 27, 2013 18:53 |  #1

I just picked up a brand new 24-70 f2.8 II lens. I was testing out its sharpness, taking snapshots around the neighborhood, and I wanted to get everyone's opinion on it. The first pic is with AF...the second with manual focus.

IMAGE NOT FOUND
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IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
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And here is 100% crop. Once again, first pic is AF, second is MF.
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
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IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
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The image is clearly sharper when I manually focus. I'm shooting on a Canon 6D with only the center AF point used. Both shot at 70mm. Is this something I should be experiencing on a brand new lens, and is there anything I can do to get the focus sharper?



  
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MalVeauX
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Nov 27, 2013 19:10 |  #2

Heya,

It's very close, just glancing you can't tell, but peeping you can see your 2nd shot being a touch sharper. It's not night and day though. It may be a very tiny touch of front/rear focus with the lens. You could send it in to be calibrated with the lens properly. This isn't unheard of with nicer bodies & lenses.

What settings did you use? Best to test wide open on aperture. Your "manual" image shows the cacti also being more in focus. Makes me wonder what depth of field you had with the aperture.

Also, why is the exposure so different? What mode/settings?

I would re-test this on a tripod in manual with specifically set settings so you're not getting differences from the camera and simply isolate the lens. Then do an AF image. And then do a manual focus image. Use a remote shutter trigger. For the image, use something that has items in a front/middle/rear setup so you can focus on one and see which ends up more in focus to help determine if you're getting some front/rear focus issues. A handful of bottles or some spray cans, or something like that, would work fine. You could even do it indoors. I would test at different focal lengths and distances too to help isolate if it's a particular focal length, or a distance at one or all focal lengths that this issue is most pronounced.

Very best,


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b7a4
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Nov 27, 2013 19:17 |  #3

Shot on P. Probably should of shot manual, but I was concentrating on the focus.
Image 1 (AF)
f/2.8, Shutter: 1/80, ISO: 320

Image 2 (MF)
f/2.8, Shutter: 1/60, ISO: 200

Around how long does it take to send something in for calibration?




  
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renagade69
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Nov 27, 2013 20:40 |  #4

Another good test would be setting it up on a tripod and use live view to take the first picture. Live view uses another means to focus that is more accurate. Then do a test with your auto focus. Both shots taken using your wi-fi or remote shutter release.Make sure you turn off any in camera lens corrections. Both shots should be the same settings in manual mode. I would download, and print a focus test target.

More here-A must read for your testing.
http://photographylife​.com …dslr-for-autofocus-issues (external link)


------------
Canon 1DX
Canon -
EF 16-35mm f/2.8L II USM , EF 24-70mm f/2.8L II USM,EF 70-200mm f/2.8L IS II USM

  
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klassenl
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Nov 27, 2013 21:17 |  #5

If you're going to nitpick over the differences presented above you should remember that most of us hobby photographers will never ever ever be able to afford to buy a NEW lens. Quit testing and go shooting and then make some prints and be happy.


_______________
Canon XS - EF 17-40 f4 L - Sigma 24-105 f4 - EF 70-200 f4 L - Nissin Di622 - Manfrotto 7302YB - Swiss Gear slinghttp://www.pinterest.c​om/pin/create/extensio​n/ (external link)

  
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Mike ­ K
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Nov 27, 2013 21:40 |  #6

renagade69 wrote in post #16485374 (external link)
Another good test would be setting it up on a tripod and use live view to take the first picture. Live view uses another means to focus that is more accurate. Then do a test with your auto focus.

I agree generally with this approach as I feel that 10X magnified Live view manual focus is as good as a basis of comparison when evaluating your auto focus.

Use a target that has decent contrast in good light. The recommended minimum target distance is 50X focal length, or about 4-12 ft for your 24-70mm lens. I don't actually take a picture, but first perform manual focus as well as I can with 10X magnified live view. Then AF to see if the the focus is poorer or the same (ideally). If the lens/camera body are a bit out of calibration, you should really consider micro adjustment. Its in your electronic 6D manual page 314 and you want feature adjust by lens, p316. Adjust the AF offset at both ends of your zoom range and the camera will interpolate intermediate zoom position calibration.
Remember that both the camera and lens can be performing within specification and your particular combination of lens and camera body may not yield optimum results. The 24-70 II L should yield very sharp pictures.
Mike K


Canon 6D, 1DmkII, IR modified 5DII with lots of Canon L, TSE and Zeiss ZE lenses

  
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commonjunks
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Nov 27, 2013 21:46 |  #7

seems a bit blur to me, is it human error?
for any new lens i will advise to use tripod for testing shot.


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Stone ­ 13
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Nov 28, 2013 15:28 |  #8

the images are close but the mf shot is clearly sharper. 1/80s @ 70mm is pretty close to 1/fl rule, looks like a bit of camera shake to me.


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b7a4
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Dec 01, 2013 15:04 |  #9

Doing some more testing....am I crazy or is LiveView AF more accurate than regular AF?




  
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MakisM1
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Dec 01, 2013 15:10 |  #10

b7a4 wrote in post #16493200 (external link)
Doing some more testing....am I crazy or is LiveView AF more accurate than regular AF?

Yes! :D


Gerry
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ed ­ rader
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Dec 01, 2013 15:16 as a reply to  @ MakisM1's post |  #11

another scientific POTN anal exam sure to cast doubt, confuse the masses and fuel the haters ;)


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Dec 01, 2013 15:24 as a reply to  @ ed rader's post |  #12

It is equally possible that the sign is moving slightly with the breeze! You have a world-class lens, so go out on a real world shooting spree then judge results. If you see a problem at that point, then go the route of printing a test target and using a tripod, Mirror lockup and timer or remote. But first get out and give it a chance au natural!




  
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b7a4
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Dec 01, 2013 15:45 |  #13

Ok...did some more testing...this time with a sturdy manfrotto tripod. Every shot on Manual...f/2.8, 1/400s, ISO100...all at 70mm. Set the shoot mode to 10 second, so that there would be absolutely no shake by the time the shutter clicked. I tested at 3 distances...6ft, 12 ft, and 25ft. At each distance, I focused using three methods. AF (center point), LiveView AF, and LiveView MF. All my LiveView AF and MF were spot on, so I won't even post results from the MF. Where there is definitely slight misfocus is on AF. Here are the results:

6ft
Auto-Focus (center point)

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
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LiveView AF
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
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12ft
Auto-Focus (center point)
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR


LiveView AF
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR


25ft
Auto-Focus (center point)
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR


LiveView AF
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR


It seems as the distance increases, the AF misfocus gets gradually worse.



  
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b7a4
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Dec 01, 2013 16:01 |  #14

I will try the Microadjustment....but will that affect the LiveView AF? Because that seems to be pretty accurate. I just need to adjust the AF




  
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renagade69
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Dec 01, 2013 16:24 |  #15

Micro adjustment only effects the auto focus. The Live View focuses in a different way. Do you have other lens's to try on your camera? If so does every one do the same thing? If they do then you may want to send the camera in.


------------
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Canon -
EF 16-35mm f/2.8L II USM , EF 24-70mm f/2.8L II USM,EF 70-200mm f/2.8L IS II USM

  
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24-70mm f2.8 II focus
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