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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 18 Sep 2010 (Saturday) 23:04
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Microadjusting zoom lenses

 
MatthewW
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Sep 18, 2010 23:04 |  #1

Is there any point microadjusting zoom lenses, given their performance varies depending at which end of the zoom you are working?

I ask this as I've been experimenting with my 24-105L on my 5DMKII...and it appears to me I see a marked improvement at the 105 end when I shift the adjustment to around +15...but the improvement is negligable when I start to work between 40-80mm focal lengths.

Frankly, I don't think I can be bothered dialling in +15 of microadjust every time I want to work at the lens's longest focal length.

My feeling is this feature (microadjust) offers more for those working with primes.


Canon 5DMKIII, 24-105L, 70-200L f2.8IS, 50 1.4

  
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JonSC
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Sep 18, 2010 23:36 |  #2

Well sometimes for zooms, people microadjust to benefit the focal length they shoot with more.



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| 24-70 f/2.8L | 70-200 f/2.8L IS Mark II | Sigma 35 f/1.4A | 50 f/1.4 | 580 EX II | 1.4x T.C.

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Mike ­ K
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Sep 18, 2010 23:51 |  #3

How about in the middle of the range, say 50mm? Another strategy is to MA at the focal length you use the most, or is most important to you.
If none of these approaches satisfy you can send the lens back in, but unless it is off at the desired zoom position, there is no guarantee it will be better.
Mike K


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

  
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malla1962
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Sep 19, 2010 02:55 as a reply to  @ Mike K's post |  #4

I think its just a zoom thing, they are shaper at one end or the other.


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MatthewW
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Sep 19, 2010 03:15 |  #5

malla1962 wrote in post #10935547 (external link)
I think its just a zoom thing, they are shaper at one end or the other.

Yes...but as per the original post...is there any point microadjusting for this discrepancy?


Canon 5DMKIII, 24-105L, 70-200L f2.8IS, 50 1.4

  
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NinetyEight
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Sep 19, 2010 04:35 |  #6

malla1962 wrote in post #10935547 (external link)
I think its just a zoom thing, they are shaper at one end or the other.

Sharpness is a different thing to being out of focus.

I agree a lens can be sharp at one end or a bit soft at the other, but not focusing where it should is a seperate issue. At least if it focuses properly it will be at it's best.

Personally I don't have any zooms with real problems, but my 24-105 was slightly out and was noticeable at the long end, this was calibrated at the long end (105mm) and it made a world of difference without appearing to affect the wide end. At the wide end it's not so noticeable anyway.

MatthewW - I'd send it in for calibration personally +15 is quite a way off and Canon can calibrate at about 6(?) different focal lengths I believe.


Kev

  
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JeffreyG
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Sep 19, 2010 07:32 |  #7

I have found MA to be a pretty useless feature for two reasons.

There is no 'right' setting for a zoom. A little + setting seemed to make my 70-200 sharper at 200mm, but at the same time it got worse at 70mm. This result has proven typical for my zooms.

Even if you have primes, it seems that the 'right' MA setting is not the same with varying subject distance.

I use nine Canon lenses on a 1D Mark IV with MA and on a 5D which lacks the feature. Lack of MA is not a problem on the 5D.


My personal stuff:http://www.flickr.com/​photos/jngirbach/sets/ (external link)
I use a Canon 5DIII and a Sony A7rIII

  
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Microadjusting zoom lenses
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