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EF 70-200 L IS USM (Type 1) microadjustment issue

post #1 of 14
Thread Starter 
So i've got an issue with this lens and its dead annoying.

I tested this with a rules, focussing on the 20cm mark.
here is the 70mm end, with 0 MA (Microadjustments used)


This is at the 200mm end with 0 MA


As you can spot, focus is nowhere near the 20cm mark.

so i played around with MA, this is 200mm with +20 MA


This was on a 5D mark II, with f/2.8 setting, my 24-105 is sharp on all focal lengths on f/4.

what do i do now, i bought this 2nd hand, should i let the seller fix the problem, should i send it to canon, or is there nothing they can do about this issue ?
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post #2 of 14
are you using single center focus point? also you really should use something different that gives you camera a more guaranteed high contrast line to focus on as the 5D2 and any other camera will have trouble being pinpoint accurate focussing on exactly what you point it at in that situation where a rule is being used. setup a tripod and a more traditional focus test chart

http://i405.photobucket.com/albums/pp135/AdriaanZelf/focus21TestChardOnly.jpg
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post #3 of 14
Microadjust can (and usually does) differ from one focal length to another, but that doesn't mean that nothing is wrong.

Do as Conspiracy says. Set up the camera on a tripod, use a more traditional chart with larger, easier varying contrast items, and use the ruler at a 45 degree angle with the zero lined up with your target (i.e. make your own version of a Lens Align system, seen here -

http://www.amazon.com/LensAlign-MkII-Focus-Calibration-System/dp/B004G3PANY

It won't quite be exact obviously, but by doing this and ONLY changing the zoom, you help get more consistent results.

Have you noticed in the course of shooting that the lens front focuses at the long end?
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post #4 of 14
Thread Starter 
Well, i contacted official canon support, and they also say something is wrong with the lens, but before i make an appointment i will test this out.
also yeah, i was in the zoo yesterdag and all my 200mm shots where out of focus, but my 5D2 said that it was focussed on. 70mm shots were good tho.
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post #5 of 14
I don't have MA on my old 1000D. But i have had this same problem with the same lens.
I had wondered if it was a problem with the lens or the body, but was not sure how to go about fixing the problem.
I often have to shoot the same subject 3 times to get one sharp image.

Please keep us updated on what the issue is, where or who fixed the lens and the cost.
post #6 of 14
Thread Starter 
Quote:
Originally Posted by micro5797 View Post

I don't have MA on my old 1000D. But i have had this same problem with the same lens.
I had wondered if it was a problem with the lens or the body, but was not sure how to go about fixing the problem.
I often have to shoot the same subject 3 times to get one sharp image.

Please keep us updated on what the issue is, where or who fixed the lens and the cost.

I've Contacted an official canon repair centre this morning, they said fixing this would cost me 80 euro's excl taxes. which are 21% here.
I will probably end up doing that, just took 2 photo's of the chart i just printed out on 200mm, cant see it good on camera so i will uploade them here in a few sec.
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post #7 of 14
Thread Starter 
200mm 0 MA


This is 200mm with 20 MA


and this is 70mm 0 MA


It's quite hard to see on this chart, i found it easier to see on the ruler, it was quite a large ruler.
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post #8 of 14
the chart makes it easier for your camera to lock focus.

you really cant have it perfect at both 70 and 200. you have to work on a happy medium and MA for what fits your needs. not sure it matters THAT much but its generally ideal to have the test chart at a 45 degree angle. most important part is to keep it as consistent as possible. if you MA using a chart and handheld dont expect it to be perfect wink.gif
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post #9 of 14
Thread Starter 
Quote:
Originally Posted by Conspiracy View Post

the chart makes it easier for your camera to lock focus.

you really cant have it perfect at both 70 and 200. you have to work on a happy medium and MA for what fits your needs. not sure it matters THAT much but its generally ideal to have the test chart at a 45 degree angle. most important part is to keep it as consistent as possible. if you MA using a chart and handheld dont expect it to be perfect wink.gif

I understand it will never be perfect, but having it sharp @ 70mm with 0MA, but needing +20MA @ 200mm seems a bit extreme, so i will have it professionaly calibrated by canon.
i've got nothign to loose honostly, i dont think it will get worse if they calibrate it correctly. as they dont work with microadjustments there but they are going to professionaly calibrate the lens.
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post #10 of 14
With that much fluctuation from 70 vs the 200 point, you may have a ever so slightly misaligned element. Hopefully that's not the case though.
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