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Thread started 07 Sep 2011 (Wednesday) 18:33
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Canon 24-70 F2.8L Help

 
SoupaSeb
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Sep 07, 2011 18:33 |  #1

I recently bought a used Canon 24-70mm F2.8L lens used off of Craigslist. (The seller wasn't sketchy at all btw). It's in perfect conditionally visually, and after testing it I didn't notice anything off, but after using it a bit more, I've noticed that at F2.8, bright edges seem to spill out. I've used a 24-70 a lot before, but I've never actually owned one. I'm pretty sure this is not normal. In the attached pictures, the first one is my 24-70 at 70mm F2.8. The second one is at 70mm F4.0. You can see the all of the lights have a bokeh effect. The focus point is on the left traffic light. If I could attach a third file I'd attach a comparison of my 70-200mm at F4, but I'll just say that it is much much sharper. I've put it on a tripod and used live view 10x magnification on my 60D to see if it was an AF issue but no matter how I adjust the focus this is the best it gets. Does anybody know what this problem (if it actually is a problem) and if it is, should I be chasing this guy for my money back? Thanks in advance.


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aboss3
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Sep 07, 2011 18:35 |  #2
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Not normal. 24-70L is not known for great corner sharpness, however not to this extent. How is it in the center, to compare at f/2.8?


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skid00skid00
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Sep 07, 2011 19:03 |  #3

I shoot alot at 2.8, and I've never seen that (but I shoot nature, so not much in the way of lights).




  
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Frugal
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Sep 07, 2011 19:10 as a reply to  @ skid00skid00's post |  #4

Note to self: don't buy a lens off Craigslist

The flare is everywhere - you're just noticing it more on the brighter parts of the scene. And yes you should get a refund.


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theextremist04
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Sep 07, 2011 19:22 |  #5

I don't know what shutter speed you were at, but you're outside and wide open so I would assume it's okay. In which case, there's something way wrong with that lens.


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frankk
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Sep 07, 2011 19:25 as a reply to  @ skid00skid00's post |  #6

Return if you can, otherwise send it in for a clean and calibrate. Hopefully it's as simply as an alignment.




  
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NewEnglandPhotographer
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Sep 07, 2011 19:32 |  #7

do you have a shot of something that you focused on that isn't a half mile away? how about within 10 ft?


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SoupaSeb
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Sep 07, 2011 19:49 as a reply to  @ NewEnglandPhotographer's post |  #8

All right so here's the 70-200mm at F4, so you can compare to my 24-70 at F4

Also here's a 100% portion of a keyboard. The focus point is right on the "o" of "option". I'll get a hold of the seller, I still have contact with him, but does anybody have any idea what the actual problem might be? Alignment perhaps? It would give me a stronger argument. Benefit of Craigslist: I know where he lives...


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ed ­ rader
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Sep 07, 2011 19:52 as a reply to  @ SoupaSeb's post |  #9

All right so here's the 70-200mm at F4, so you can compare to my 24-70 at F4


that's pretty soft for the 70-200 f4. are you sure you know what you are doing :cool:?

ed


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SoupaSeb
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Sep 07, 2011 19:58 |  #10

Even if I didn't know what I was doing, it would be pretty hard to screw up a perfectly good 24-70mm F2.8L to the point where I get bokeh on what I'm focusing on...and weird teardrop shaped bokeh too... :(

And if this is a microadjustment issue my Canon 60D doesn't have it the ability :(




  
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S.Horton
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Sep 07, 2011 20:09 |  #11

Wow. That is really bad. Get rid of it if you can.


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Delija
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Sep 07, 2011 20:14 |  #12

SoupaSeb wrote in post #13066999 (external link)
...

And if this is a microadjustment issue my Canon 60D doesn't have it the ability :(

1..Way beyond what any microadjustment would remedy.

2...You bought from someone at Craigslist - you didn't try the lens before you paid?

3...Make sure the REAR element is not greasy or just dirty - you can look at the front element too, but that's not likely to have not been obvious and it would have to be extremely bad (like covered with a thick coat of Vaseline). Also if there's a filter on the front, take it off and see if that helps (they never IMPROVE image quality). A cheap filter makes a great lens only as good as the filter itself (weakest link in a chain) and a good filter will still degrade the lens. Use a hood to protect your lens instead.

If you can't get your money back, send the lens to Canon - it's worthless the way it is (although your 70-200 image is pretty bad too - My $50 18-55 IS has better image quality than your "L" lens? User error can't be ruled out.

Good luck,
D.


Wow, what a nice picture! You must have a really great camera!

  
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TeamSpeed
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Sep 07, 2011 20:14 |  #13

No filters on the lens, correct? If you go to live view and manually focus, then take a shot, do you get anything more usable?


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vabeltfed
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Sep 07, 2011 20:15 |  #14

Do more testing and if it is bad, send it in for repair. Please don't sell it off without letting the buyers know the condition.




  
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SoupaSeb
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Sep 07, 2011 20:27 |  #15

Delija wrote in post #13067082 (external link)
2...You bought from someone at Craigslist - you didn't try the lens before you paid?
.

I tested it but I didn't have the chance to test it on anything that had lots of detail, like the scenery from the 38th floor of my condo...

vabeltfed wrote in post #13067089 (external link)
Do more testing and if it is bad, send it in for repair. Please don't sell it off without letting the buyers know the condition.

I'm going through enough hell right now with my lens I wouldn't wish this upon my worst enemy


EDIT: Oh right and to anybody saying that my 70-200 is soft, today was really bad weather-wise. Really dark. Pretty sure it was with like 640-800 ISO or something silly like that. I've never had anything to compare to my 70-200 before. You know what I probably don't even know what I'm doing. I quit photography.




  
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Canon 24-70 F2.8L Help
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