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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 01 Sep 2013 (Sunday) 19:17
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EF 100mm f/2.8 L Macro

 
sumnersn
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Sep 01, 2013 19:17 |  #1

Hi all
I purchased this lens on the weekend, upgrading from 100mm non L model. Very impressed with the sharpness but have some questions over the auto focusing on distance shooting.
Three settings are avail those being:
FULL .3m to infinity
.3 to .5
.5 to infinity
Now I have no issues with focusing using the macro end, however when trying to focus on distance the lens does not try to focus until I start to manual focus and then it will focus automatically. I set the focus to FULL in this instance.

Was wondering if any one has this experience. I have reported it to TEDS and they are willing to exchange the lens (once a new one arrives) but if this is part of it's normal behaviour it could save me a trip.

cheers Neil


AKA Oz Lefty
Gear ... Canon 6D, EF 70-200mm f2.8L IS II USM, EF 100mm f2.8L IS USM Macro, EF 24-105mm f4L IS, EF 50mm f1.4, EF 17-40mm f4L, Samyang 14mm f2.8, 580EX II Speedlight

  
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tat3406
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Sep 01, 2013 20:11 |  #2

Check your C-FN menu setting in camera, "Lens drive when AF impossible", if the setting is "stop focus search", change to another.


6D, 100L,24-70 F4L, 40mm pancake, 70-300L
Carl Zeiss MP 50
http://www.flickr.com/​photos/tat3406/ (external link)

  
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sumnersn
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Sep 01, 2013 20:17 |  #3

tat3406 wrote in post #16259887 (external link)
Check your C-FN menu setting in camera, "Lens drive when AF impossible", if the setting is "stop focus search", change to another.

thanks for this info ... I do remember setting this to stop focus when I first got the camera, never had issue with other lenses though. Will change it and try again.


AKA Oz Lefty
Gear ... Canon 6D, EF 70-200mm f2.8L IS II USM, EF 100mm f2.8L IS USM Macro, EF 24-105mm f4L IS, EF 50mm f1.4, EF 17-40mm f4L, Samyang 14mm f2.8, 580EX II Speedlight

  
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Ephur
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Sep 01, 2013 23:37 |  #4

Summers, or you can just give the focus ring a turn, and get your focus closer then let AF take over. I leave the setting to not focus hunt, because it tends to make AF slower if you're coming from a place where the lens is way out of focus, quicker to hit AF, get nothing, turn it fast, then let AF finish it up.




  
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sumnersn
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Sep 01, 2013 23:45 |  #5

Ephur wrote in post #16260287 (external link)
Summers, or you can just give the focus ring a turn, and get your focus closer then let AF take over. I leave the setting to not focus hunt, because it tends to make AF slower if you're coming from a place where the lens is way out of focus, quicker to hit AF, get nothing, turn it fast, then let AF finish it up.

cheers :)I was more worried that I had a dud ... as you said above I also have mine set to 'no focus hunt' but going to switch it and see if it does make a difference. I don't experience this problem with any other lens I own and I wanted to know if this was normal for the L Macro lens.


AKA Oz Lefty
Gear ... Canon 6D, EF 70-200mm f2.8L IS II USM, EF 100mm f2.8L IS USM Macro, EF 24-105mm f4L IS, EF 50mm f1.4, EF 17-40mm f4L, Samyang 14mm f2.8, 580EX II Speedlight

  
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1Tanker
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Sep 01, 2013 23:51 |  #6

sumnersn wrote in post #16260298 (external link)
cheers :)I was more worried that I had a dud ... as you said above I also have mine set to 'no focus hunt' but going to switch it and see if it does make a difference. I don't experience this problem with any other lens I own and I wanted to know if this was normal for the L Macro lens.

Well, macro lenses do have a much larger focus range to travel, but your non-IS would/should have had the same issue.


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lovemyram4x4
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Sep 02, 2013 01:15 |  #7

Setting the focus limit also helps AF a lot.




  
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Grand_gator
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Sep 02, 2013 01:21 |  #8

lovemyram4x4 wrote in post #16260407 (external link)
Setting the focus limit also helps AF a lot.

I could not agree more.....


5Diii / 70-200 L IS II / 100-400 L IS II / 24-105 L IS / 100mm 2.8 L Macro IS / Σ 35mm 1.4 Art / Σ 85mm 1.4 Art / EF-S 10-22mm / EF-S 17-55mm IS / EF 70-300mm IS / 50mm 1.8 II / 600 EX RT + 430 EX II

  
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apersson850
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Sep 02, 2013 08:51 as a reply to  @ Grand_gator's post |  #9

But mainly from a speed perspective. The Lens drive when AF impossible is there to allow you to avoid loosing the time it takes for the camera to drive the lens from one end to the other, when the camera's AF sensor can't see any contrast to focus on.
If you limit the AF range, then the focus search operation, from one end to the other, takes a significantly shorter time (typically half of a full stroke). If you already have set Lens drive when AF impossible to off, then there's nothing to gain. It will not do the search anyway.


Anders

  
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tat3406
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Sep 02, 2013 22:08 |  #10

sumnersn wrote in post #16260298 (external link)
cheers :)I was more worried that I had a dud ... as you said above I also have mine set to 'no focus hunt' but going to switch it and see if it does make a difference. I don't experience this problem with any other lens I own and I wanted to know if this was normal for the L Macro lens.


This only effect on this lens as far as I know. When u shoot at MFD and point to far away subject, the lens will see nothing to focus, the 100mm L have 3 stage limiter switch, very helpful for fast focusing without long hunting. I think Canon should have firmware update for this issue.


6D, 100L,24-70 F4L, 40mm pancake, 70-300L
Carl Zeiss MP 50
http://www.flickr.com/​photos/tat3406/ (external link)

  
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sumnersn
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Sep 02, 2013 23:27 |  #11

thanks guys !


AKA Oz Lefty
Gear ... Canon 6D, EF 70-200mm f2.8L IS II USM, EF 100mm f2.8L IS USM Macro, EF 24-105mm f4L IS, EF 50mm f1.4, EF 17-40mm f4L, Samyang 14mm f2.8, 580EX II Speedlight

  
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apersson850
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Sep 03, 2013 05:26 as a reply to  @ sumnersn's post |  #12

The Lens drive when AF impossible setting is effective with many lenses, which have long range AF setting capability and shallow depth of field. A macro lens is a typical example, a long telephoto is another. Try the same with an EF 70-200 mm f/2.8L IS II USM, and you'll probably find that if you focus at the closest distance (1.2 m) with the zoom set at 200 mm, then aim it at infinity, it doesn't know where to go if you have disabled the lens drive function.


Anders

  
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EF 100mm f/2.8 L Macro
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