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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 25 Aug 2009 (Tuesday) 18:21
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24-70...is it really that hard to get a good copy???

 
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Aug 27, 2009 07:06 |  #46

snyderman wrote in post #8531277 (external link)
Mine is on a 50D with microadjust at "0." Unfortunatly, I'm still too inexperienced to really judge the natural sharpness of my 24-70. It looks pretty sharp to me.

dave

That's all that matters, if it is sharp enough for you, then it is fine. You will go crazy trying to one-up somebody else by microadjusting, sending in lenses for service, swapping lenses, etc. If you are happy, it is just fine!


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Kuma
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Aug 27, 2009 07:24 as a reply to  @ post 8523388 |  #47

First try and my copy is sharp with no issues. I feel sorry for the people who've had problems with this lens. On the other hand I've read quite a few posts where it was definitely user error.




  
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merp
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Aug 27, 2009 07:37 |  #48
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minesss good




  
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AlanU
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Aug 27, 2009 10:22 |  #49

Krapo wrote in post #8531087 (external link)
My copy is razor sharp at all range and aperture. However, I do have rear-focusing issues at wide range (24-40).
Typical situations: group shots. You lock the focus on the group with the center AF point, and when you look at the picture you see that the focus was made on the wall 5 meters behind.
That's a real problem for me.
I'll probably end up sending it to Canon (although it's not under warranty since I bought it in the US), but right now I would be better off with a prime.

A real pity because the colour, contrast and sharpness of this lens are awesome, and I love its range.

I think this is more common than not. Since I use the long end more i dont see this often. On my 50d I saw this BF issue on the wide end wide open, even stopped down a tad. I dont see this all the time but its occurred even when I do several identical frames.

If people are observant they may see this anomaly.


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greazyjungle
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Aug 27, 2009 10:27 as a reply to  @ AlanU's post |  #50

I think may of those complaining about 'bad copies' have SOFT technique...not a soft lens...

Mine is tack sharp!!


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Krapo
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Aug 27, 2009 11:38 |  #51

AlanU wrote in post #8532290 (external link)
I think this is more common than not. Since I use the long end more i dont see this often. On my 50d I saw this BF issue on the wide end wide open, even stopped down a tad. I dont see this all the time but its occurred even when I do several identical frames.

If people are observant they may see this anomaly.

I'm afraid you're right. The most relayed issue with the brick is back-focusing, not sharpness issue.
Even on my BF shots, the element on which the focus ended up is tack sharp. It's just not the point you wanted to focus on :)

I still believe this is a great lens due to its range and aperture, but I'm really puzzled by Canon's quality control process.

I would understand if all the faulty lenses were from the same batch, but it's been a while since this issue came up!
I mean, it's not like this is something that cannot easily be tested at the end of the assembly line! On top of that, people who send their bad lens to Canon eventually get it fix. So why not fix it in the first place before the lens leaves the factory??!

It doesn't matter what is the default rate, although I believe it's far from a six sigma process... What matters is that they deliberatly let bad copies leave the factory, knowing there is an issue. For self-proclaimed "Luxury"-grade lenses costing more than a grand, this is just unacceptable.


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Krapo
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Aug 27, 2009 11:45 |  #52

greazyjungle wrote in post #8532322 (external link)
I think may of those complaining about 'bad copies' have SOFT technique...not a soft lens...

Mine is tack sharp!!

And I think your statement is rather bold, to say the least.
Believe me, I know how to focus and I have never experienced this problem with any other lens.

You're lucky to have a good copy. I'm not saying that this lens is r@p (INVALID EMAIL) -far at the contrary- nor that most copies are bad. But if someone wants to buy it, he should know what to check before he leaves the shop with his new toy.

And people should also know that Canon has chosen to outsource its quality control process to its customers...


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Aug 27, 2009 11:55 |  #53
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great lens and very sharp but i sold mine and dont really miss it. it was just too big and heavy for what it was. id rather use primes.

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J_TULLAR
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Aug 27, 2009 12:07 |  #54

1st...what the crap is that^ 2nd I hope mine is sharp when it arrives....


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hvulpus
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Aug 27, 2009 12:11 as a reply to  @ Krapo's post |  #55

I am currently in the process of having my 50D/24-70L recalibrated by Canon. Bought it at B and H, took it with me on a 5-week trip to shoot related to my work (art historian), then found in the field that it was soft. I could sharpen in post-shoot well enough for a Powerpoint presentation; but shots did not come out of the camera at the sharpness one expects from such a rig. In fact, for architectural detail and texture of, say, stone or glass, sharpness is important.

Sent it off once to Canon and came back with explanation for 50D, "it was found that the part was out of position the focus did not operate properly. Adjusted exposure & f/b focus w/ lens, cleaned C-MOS and checked all factory specs." And for lens, "it was found that the part was out of position the focus did not operate properly. Replaced collars. Adjusted center/tilt/focus w/body, cleaned factory specs."

It still does not focus sharply, seems somewhat erratic, short and long focal lengths, near and distant subjects, F2.8-8.0, indoors and out, with or without tripod, always shooting fast enough to prevent shake.

It is now back with Canon Factory Service in NJ.

Can anyone with experience with Canon Factory Service advise me about next steps if it still does not focus satisfactorily?

P.S. I am happy to hear of people whose equipment works, and I am indifferent to posts about technique versus equipment. But if neither is your thing and you have something substantive to advise about dealing with Canon on this sort of issue, please do not hesitate to send me a private message, and know that it will be much appreciated.


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iwishiwasafish
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Aug 27, 2009 12:16 |  #56
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J_TULLAR wrote in post #8532918 (external link)
1st...what the crap is that^ 2nd I hope mine is sharp when it arrives....


not sure what you mean but it is a baby squirrel that fell out of the nest. dont worry momma came and brought it back up. the shot was @70mm wide open.


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J_TULLAR
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Aug 27, 2009 12:19 |  #57

iwishiwasafish wrote in post #8532970 (external link)
not sure what you mean but it is a baby squirrel that fell out of the nest. dont worry momma came and brought it back up. the shot was @70mm wide open.

never seen a baby squirrel...thought it was a baby kangaroo for a sec or a chinchilla??? lol


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Aug 27, 2009 12:55 as a reply to  @ J_TULLAR's post |  #58

What will be an easy test shot and setting anyone can use and shoot to test the focus and sharpness of this lens in a shop or at home?

If there is a benchmark to compare to, it will be easier to spot a problematic piece.




  
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egordon99
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Aug 27, 2009 13:40 |  #59

hvulpus wrote in post #8532943 (external link)
I am currently in the process of having my 50D/24-70L recalibrated by Canon.

Ouch! I guess you returned your 17-55. Were the folks at The Camera Shop able to help you at all?

https://photography-on-the.net/forum/showthre​ad.php?t=686049

I must be VERY lucky because all of my lenses perform fine on both my 40D and Xsi.

No problems with my 24-70L that I bought new from B&H last month. It's a GREAT lens!




  
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Aug 27, 2009 13:46 |  #60

an interesting comment on photozone regarding the 24-70mm.....

http://www.photozone.d​e …st-report--review?start=1 (external link)

Well, I guess everybody has a nemesis and mine is the Canon EF 24-70mm f/2.8 USM L. It took me 4 (f-o-u-r) samples of the lens to get a good one - please note: "good", not a "great" sample. The first three variants showed rather hefty centering defects which spoiled the results quite a bit.

This final sample exhibited a very good to excellent center resolution at wide-open aperture throughout the tested focal length range.


5DIII, 7D, 16-35 f/2.8L II, 24-70 f/2.8L II, 24-105 f/4L, 40 f/2.8, 135 f/2L, 85 f/1.8, 100 f/2.8L macro, 70-200 f/2.8L II, 430EX II, POWERSHOT S95.... i'm your huckleberry.

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24-70...is it really that hard to get a good copy???
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