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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 05 Jun 2012 (Tuesday) 15:29
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Why me, my sudden 5DmkII focusing issues

 
joeblack2022
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Jun 07, 2012 15:40 |  #31

tzalman wrote in post #14546127 (external link)
You are mistaken.

Ok I went and looked it up in the 70-200 manual and on page 8 it states:

When you press the shutter button halfway, the Image Stabilizer will start operating.

• Make sure the image in the viewfinder is stable, then press the shutter button the rest of the way down to take the picture.

http://gdlp01.c-wss.com …f70-200f28lisiiusm-en.pdf (external link)

Is this not normal behaviour for IS on all lenses then? Or does this vary from lens to lens?


Joel

  
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scobols
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Jun 07, 2012 15:43 |  #32

joeblack2022 wrote in post #14545884 (external link)
I think the OP mentioned he was using back-button focusing (he said he was focusing with his thumb?) - unless I'm mistaken, IS is only engaged when the shutter is half-pressed?

IS will engage with back button focus as well.


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joeblack2022
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Jun 07, 2012 15:51 |  #33

scobols wrote in post #14546321 (external link)
IS will engage with back button focus as well.

Thanks for clarifying, I have not seen in the Canon BBF literature any mention of this.

Maybe I just haven't looked in the right place..?


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MakisM1
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Jun 07, 2012 16:15 |  #34

Doesn't it stand to reason to start the IS when AF is started?

If you BBF and half pressing the shutter button only starts light metering, why should it start IS?


Gerry
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OS: Linux Ubuntu/PostProcessing: Darktable/Image Processing: GIMP

  
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lannes
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Jun 07, 2012 17:40 |  #35

On the bad pics, could be too slow a shutter speed, even wide open at 1600 iso with IS, 1/125 could be a bit slow for the lighting conditions on the day.

You'll notice the good pic on the baby's face was at a higher shutter speed and lower ISO.

Maybe with the close up pictures your right on the cusp of the MFD (minimum focusing distance) so if you move ever so slightly foward, the lens won't be able to focus.


1Dx, 1DM4, 5DM2, 7D, EOS-M, 8-15L, 17-40L, 24 TSE II, 24-105L, 50L, 85L II, 100L, 135L, 200L f/2.8, 300L f/4, 70-200L II, 70-300L, 400Lf/5.6

  
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Why me, my sudden 5DmkII focusing issues
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
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