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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 06 Oct 2013 (Sunday) 15:17
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Back/Front focusing issues.

 
Dick ­ Emery
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Oct 06, 2013 15:17 |  #1

So I've been playing with my new 70D and kit 18-135mm STM lens. Is it normal for me to have micro adjust the lens to the body? I think mine is front focusing by +1 as I have so many test shots where there is no detail in the subject.

This is a shot I took before the adjustment but noticed her eyes were really soft and her skin has no detail (also there is no eyebrow or eyelash detail).

http://i.imgur.com/Nh9​JM7P.jpg (external link)

BTW my 55-250mm EF-S F4-5.6 has quite a bit of miss-focus. I think I had to adjust the long end to -4 and the wide to -2. I am wondering if the mount on the 70D is the issue. There is some play on the lens and mount when I twist it but that might be normal?


Canon 450D/XSi (Retired), Canon 70D, Canon 18-135mm F3.5-5.6 STM, Canon 18-55mm f/3.5-5.6 EF-S IS, Canon 55-250mm f/4.0-5.6 EF-S IS, Canon 80-200mm f/4.5-5.6 EF II, Sigma 30mm F1.4, 430EX Mk I, Canon Powershot S2 IS, Canon Powershot S90 IS, Sigma 1.6x closeup lens.
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ChunkyDA
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Oct 06, 2013 18:54 |  #2

Have you considered that neither of those lenses is going to be as sharp as an L or any of the primes? Pixel peeping is going to start costing you some real money since your camera outperforms the consumer grade zooms.


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Dick ­ Emery
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Oct 08, 2013 07:48 |  #3

ChunkyDA wrote in post #16351100 (external link)
Have you considered that neither of those lenses is going to be as sharp as an L or any of the primes? Pixel peeping is going to start costing you some real money since your camera outperforms the consumer grade zooms.

For sure. But the problem is it's not locking focus correctly on where I had the middle AF point. The face. The focus was sharpest on her arm (can see the hairs on her forearm) but no detail on her face. This happened on a lot of shots before I pulled the micro adjust back by -1. I need to go do another run of test shots of some people (I live alone so it's problematic at the moment) at -1 on the tele end though to be certain. Oh and the other thing is the AF would sometimes not focus or be slow to focus and not let me take the shot. This can happen with low contrast or low light shots but I was seeing it on things where there was plenty of light and enough contrast so it could be confusing the AF system if the lens is slightly out.


Canon 450D/XSi (Retired), Canon 70D, Canon 18-135mm F3.5-5.6 STM, Canon 18-55mm f/3.5-5.6 EF-S IS, Canon 55-250mm f/4.0-5.6 EF-S IS, Canon 80-200mm f/4.5-5.6 EF II, Sigma 30mm F1.4, 430EX Mk I, Canon Powershot S2 IS, Canon Powershot S90 IS, Sigma 1.6x closeup lens.
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Dick ­ Emery
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Oct 08, 2013 17:30 as a reply to  @ Dick Emery's post |  #4

OK I give up for now. I have found that my methodology is too unreliable and my tripod too unstable to perform a proper lens adjustment. I have cleared all settings on the camera and will go back to square one.


Canon 450D/XSi (Retired), Canon 70D, Canon 18-135mm F3.5-5.6 STM, Canon 18-55mm f/3.5-5.6 EF-S IS, Canon 55-250mm f/4.0-5.6 EF-S IS, Canon 80-200mm f/4.5-5.6 EF II, Sigma 30mm F1.4, 430EX Mk I, Canon Powershot S2 IS, Canon Powershot S90 IS, Sigma 1.6x closeup lens.
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www.maunders.com (external link)

  
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Back/Front focusing issues.
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