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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 27 Aug 2012 (Monday) 14:55
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Focus issues with 100-400

 
barrie
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Aug 27, 2012 14:55 |  #1

Why would my 100-400L not focus with the IS turned on? If I half press the shutter the focus seems to "slide" down the lens. If i point it at an object and half press the shutter, the focus points move around and as soon as I lift off of the shutter it jumps back to center. What could cause this. It stays rock steady if the IS is turned off. Taking pictures of printed matter across the room is blurry with IS on and clear with it off. Any ideas/ help would be appreciated.


60D, 70-300L is,100-400mm, 50mm 1.4, 15-85mm,18-55mm, 55-250mm,18-55Mkii, 28-135is 100mm 2.8 macro,macro ring light.SLIK pro700dx tripod,SLIK pro pod 600 monopod,SLIK AF1100E ball head and Kenco 1.4 teleconverter and boat loads of inexperience.

  
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TSchrief
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Aug 27, 2012 16:02 |  #2
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Check the focus limiter. It may be set to the longer range, prohibiting you from focusing on anything less than 20 feet or so away. What camera are you using?


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5Dmaniac
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Aug 27, 2012 16:04 |  #3

Mine does the same thing - it's normal. With the IS on the focus seems to slide down, but it really does not - just look at your results. This lens has a pretty old IS technology - it is way overdue for a new version.




  
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watt100
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Aug 27, 2012 16:21 |  #4

5Dmaniac wrote in post #14914098 (external link)
Mine does the same thing - it's normal. With the IS on the focus seems to slide down, but it really does not - just look at your results.

huh??
I always leave the IS on my 100-400, never had any problems with "sliding down", seems to focus fine. Changing the focus limit switch will change behavior tho




  
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5Dmaniac
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Aug 27, 2012 16:45 |  #5

When you look through the viewfinder with the IS on you can see the focus point move - it has nothing to do with the focus limit switch. Mine's been doing it from day one but the pictures I get are sharp.




  
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watt100
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Aug 27, 2012 16:49 |  #6

5Dmaniac wrote in post #14914254 (external link)
When you look through the viewfinder with the IS on you can see the focus point move - it has nothing to do with the focus limit switch. Mine's been doing it from day one but the pictures I get are sharp.

well I'm missing something then. When I look thru the viewfinder the focus point stays in the center position (one selected). I don't see anything moving. With IS on or turned off it's still the same




  
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T2i4me
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Aug 28, 2012 00:00 |  #7

I'm with Watt100, I just tried mine and unless you are talking about a quick little image jump as IS engages, I don't see any focus point "sliding down".


-- Eric --
5DC - T2i - 100-400 L IS - 70-200 F4 L - 17-40 L - EF 85 1.8 - EF-S 10-22 - EF-S 15-85 IS - EF-S 60 macro - 430EX II

  
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barrie
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Aug 28, 2012 01:46 |  #8

Thanks for the replies, the results are not good, in my test the printed matter that i was focusing on also looks like it has jumped (double vision) and with the IS off it as clear. I have been beating myself up because of a lot of soft shots taken on a recent holiday, but a few nights ago I was taking pictures of a mountain fire and I noticed it happening also made the fire look like double vision. could it be because I am using a long exposure? I know you will not get a sharp picture of fire with a long exposure, but i shouldnt get 4 or 5 lines of the same line of light. For the test I did with the printed matter on the wall i did not alter the camera settings from the fire picture settings. I have it mounted on a 60D body and i am using a Slick 700 pro tripod


60D, 70-300L is,100-400mm, 50mm 1.4, 15-85mm,18-55mm, 55-250mm,18-55Mkii, 28-135is 100mm 2.8 macro,macro ring light.SLIK pro700dx tripod,SLIK pro pod 600 monopod,SLIK AF1100E ball head and Kenco 1.4 teleconverter and boat loads of inexperience.

  
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Hermeto
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Aug 28, 2012 01:51 |  #9
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barrie wrote in post #14916305 (external link)
Thanks for the replies, the results are not good, in my test the printed matter that i was focusing on also looks like it has jumped (double vision) and with the IS off it as clear. I have been beating myself up because of a lot of soft shots taken on a recent holiday, but a few nights ago I was taking pictures of a mountain fire and I noticed it happening also made the fire look like double vision. could it be because I am using a long exposure? I know you will not get a sharp picture of fire with a long exposure, but i shouldnt get 4 or 5 lines of the same line of light. For the test I did with the printed matter on the wall i did not alter the camera settings from the fire picture settings. I have it mounted on a 60D body and i am using a Slick 700 pro tripod

This is, most likely, the cause of your problem: when on tripod, 100-400 should be used with the IS off!


What we see depends mainly on what we look for.

  
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barrie
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Aug 28, 2012 08:09 |  #10

Thanks i will try hand held and see if its better. It does make sense though as the gyro is trying to move something that cant be moved


60D, 70-300L is,100-400mm, 50mm 1.4, 15-85mm,18-55mm, 55-250mm,18-55Mkii, 28-135is 100mm 2.8 macro,macro ring light.SLIK pro700dx tripod,SLIK pro pod 600 monopod,SLIK AF1100E ball head and Kenco 1.4 teleconverter and boat loads of inexperience.

  
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barrie
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Aug 31, 2012 16:09 |  #11

Well it looks like handheld I have no sliding issues its only when attached to my tripod. Thanks for all the help


60D, 70-300L is,100-400mm, 50mm 1.4, 15-85mm,18-55mm, 55-250mm,18-55Mkii, 28-135is 100mm 2.8 macro,macro ring light.SLIK pro700dx tripod,SLIK pro pod 600 monopod,SLIK AF1100E ball head and Kenco 1.4 teleconverter and boat loads of inexperience.

  
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Focus issues with 100-400
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