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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 09 Sep 2014 (Tuesday) 05:03
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Auto Focus of 135mmF2 at various distances

 
pankajkumars
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Sep 09, 2014 05:03 |  #1

I found that during portrait full body shots, the IQ deteriorates due to incorrect AF.
I use a 6D and from Center AF point, I can AF my 135mmF2 on subject's eyes in a portrait shoot. At distances of 2-4 m, the subject's eyes get perfectly focused and image looks great. But when the subject distance increases, in full body shots, the Center point covers more than eyes and >50% of faces. At that time, the sharpness decreases and I blame AF for this.

In those cases where I see through viewfinders and focuses on subject's eye, and when the center point covers much part of the face, I see AF is not upto the mark.
Do I need to go liveview with zooming of view to correct AF.

Please help me find the best method to get correct AF when subject is at >15m.


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hennie
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Sep 09, 2014 05:07 |  #2

Stop down




  
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titi_67207
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Sep 09, 2014 05:23 |  #3

Try the micro-adjustments on long distances and check if the autofocus is still OK on shorter.

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Rad ­ Encarnacion
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Sep 09, 2014 06:12 |  #4

pankajkumars wrote in post #17143705 (external link)
Please help me find the best method to get correct AF when subject is at >15m.

The best method is to use a tripod and liveview AF - Flexi-zone Single - and put the AF box on the subject's face.

The only way I can see you using center-point AF on eyes for full body shots is by focus and recompose - highly not recommended when you're shooting hand-held at F2. If that's what you're doing, you're probably better off just framing your subject first, then using the center point to focus on whatever part of the subject it lands on (likely the abdomen). At 15m or more, you should have enough DOF (~1.5m, according to DOFMaster) to forgive a slight decimeter or two of missed focus.


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JeffreyG
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Sep 09, 2014 08:44 |  #5

I had a 135L that was accurate at close range (< 3 meters) but increasingly backfocused at longer ranges. I sent it in to Canon for service, and they were able to fix the lens.


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bob_r
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Sep 09, 2014 10:56 |  #6

I had to send my 135L to Canon 3 times to get the AF corrected. The last time I sent the camera too and it came back perfect.


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ejenner
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Sep 09, 2014 22:40 as a reply to  @ bob_r's post |  #7

I would make sure it is the AF - i.e. different microadjust at different distances. But if you are convinced I would send it in, with the camera.

Mine does move a little at super-close distances near MFD.

Make sure you are not use AF point expansion when you test though.


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pankajkumars
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Sep 10, 2014 03:33 |  #8

Thanks to titi_67207, Red Encarnation, JeffreyG, Bob_r and ejenner.
I got the point of doing AF when subject is at distances and Center AF point covers full face. Therefore, I will make use of live view to get face on focus.

Also, to get the clarity on AF consistency, I visited Canon Master Service Center at New Delhi in the morning. They took 2 hours to calibrate and commented that at few ranges focus was back focus very slightly. Lets hope everything goes alright. Thanks for the valuable inputs. Love this forum.


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Oct 28, 2014 08:02 as a reply to  @ pankajkumars's post |  #9

Hello.
I was having a similar issue with my 85mm 1.2 on the 6D.
After two weeks of AF fine tune I had to take it back to the retailler.
We did some tests in the store and found there was a problem with the camera AF.
After a body swap so to speak, the lens/camera hits focus every time (when I don't lash it up) without the need for micro adjustment.

The 135 is the finest lens canon make and I'd be surprised if it was the problem.

Just my thoughts.


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yogestee
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Oct 28, 2014 21:00 |  #10

hennie wrote in post #17143708 (external link)
Stop down

Blasphemy ;)


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Auto Focus of 135mmF2 at various distances
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