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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 16 Sep 2010 (Thursday) 18:37
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zoom lens sharp on one end, soft on the other

 
jm_usmc
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Sep 16, 2010 18:37 |  #1

I have a noticed my Canon 70-200 f4 non-IS is not sharp at the long end. It is plenty sharp at the shorter end, but around 140mm it starts losing sharpness.

It's not a focus issue so MA won't help will it? Will it have to go to Canon to be fixed? Any idea how much a repair might cost?


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msowsun
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Sep 16, 2010 18:51 |  #2

If it definitely is not a focus issue, the only solution I can see is sending it to Canon.

You are right about MA. MA just moves your focus point ever so slightly. It is not a magic solution for soft lenses.


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JonK
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Sep 16, 2010 18:52 |  #3

How about some examples? Are you looking at resized images or 100% crops? Post 100% crops here of 70, 135, 200 wide open on the same target same FD.


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FlyingPhotog
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Sep 16, 2010 18:53 |  #4

MA also can't compensate differently at each end of a zoom.


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jm_usmc
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Sep 16, 2010 19:08 |  #5

I don't have direct comparison shots on this computer. I'll take some as soon as I can.


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AprilArchambeau
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Sep 16, 2010 19:24 |  #6

I've heard (and noticed with mine) that it is not near as sharp say at 140mm than it is at 70mm, but I hear it is the lens and they are all like this, 100% crop at 200mm does not look too good on mine.


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AmbientMike
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Sep 16, 2010 20:30 |  #7

Telephoto zooms often aren't as sharp at the long end. Also less depth of field, are you sure you are focused?

Even the 75-300 is supposed to be REALLY sharp at the short end, Bob Atkins (has website) got 82 lp/mm or some such thing. These are perhaps not so hot at 300. I like to get a 75-300 type lens and expect it to be good to 200. But if it's falling off a lot, might be a problem. Check focus, very picky by 200, use live view with 10x if you have it.




  
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tkbslc
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Sep 17, 2010 09:40 |  #8

We are talkin about the 70-200 F4 IS, though. It should be razor sharp everywhere at every aperture.


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silvrr
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Sep 17, 2010 10:07 |  #9

I noticed this on my 70-200 also. However, this is at near MFD shooting charts. Real world situations 200 f/4 it is plenty sharp.

Are you shooting charts or actually using it?


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martin2day
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Sep 17, 2010 11:45 |  #10

We are talkin about the 70-200 F4 IS, though.

No, we are not.

I have a noticed my Canon 70-200 f4 non-IS is not sharp at the long end




  
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tkbslc
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Sep 17, 2010 11:47 |  #11

Oh, sorry! :oops:

In that case the 200mm end should be softer than 70, but not "soft".


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jm_usmc
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Sep 19, 2010 20:12 |  #12

Well, hmmm. Guys I'm going to have to back off my claim of 'much softer'. In shooting pictures that were the same at both 70mm and 200mm for examples I'm not finding a lot of difference. The 200mm end is a little softer, but not that much.

My original claim came from what I saw in pictures using this lens to shoot sports, motorsports, and the such. I don't shoot charts or 'test' pics much, just real use stuff. I guess I'm going to have to go back to those and look at the exif to try and figure out what is going on.

I do appreciate the responses, and especially the suggestion to shoot pics so that the scene is exactly the same at both focal lengths.


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zoom lens sharp on one end, soft on the other
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