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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 28 Oct 2011 (Friday) 11:36
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24-70L low light AF performance

 
Andrew_WOT
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Oct 28, 2011 11:36 |  #1

What is everyone's experience with Canon 24-70L AF performance in less than perfect lighting condition?
Most of the time shooting indoors under dim light is frustrating, I am getting close to 50% miss ratio. Under bright sunlight with contrasty target it's almost always spot on.
Just for the heck of it I compared AF performance of Sigma 8-16, 17-40L, 100L IS Macro and 70-200 MkII under the same conditions. And all of them were pretty much right on the target, when every other shot with 24-70L was OOF.
There is no front or back focusing that I can observe when testing against LensAlign in good lighting, lens was recently calibrated by Canon Irvine, as well as a body (7D).
Do I expect too much from a decade old AF design?




  
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AlanU
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Oct 28, 2011 11:41 |  #2

With available light shooting I never grab my 24-70L. I've never had any issues with focusing or locking AF with that lens though.


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skid00skid00
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Oct 28, 2011 21:43 |  #3

If you are getting good AF in normal conditions, the lens isn't the problem, as it always focuses wide-open, at f2.8. If the IS lenses are better, it suggests you need to cut back on coffee, etc. :D

And to stress... the lens doesn't have "a decade old AF design". It only has an ultrasonic motor, which is told where to go to, by the camera.




  
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jra
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Oct 28, 2011 21:58 |  #4

In poor lighting I've always found my AF to be a little more inconsistent, but I've never noticed my 24-70 being any worse than my other lenses.




  
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Andrew_WOT
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Oct 28, 2011 22:18 |  #5

skid00skid00 wrote in post #13322957 (external link)
If you are getting good AF in normal conditions, the lens isn't the problem, as it always focuses wide-open, at f2.8. If the IS lenses are better, it suggests you need to cut back on coffee, etc. :D

And to stress... the lens doesn't have "a decade old AF design". It only has an ultrasonic motor, which is told where to go to, by the camera.

Yep, I know that AF is in the body but body to lens communication protocol has probably been evolved and older lenses might be working in less precise, backward compatible mode. But it seems to be tons better today, weird. :confused:




  
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OneJZsupra
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Oct 28, 2011 22:29 |  #6

I've gotten a few misses in lower light conditions.... It eats me up some times.


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bohdank
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Oct 29, 2011 00:07 |  #7

Depends what you mean by lowlight.

I don't have the 24-70 (never been tempted) but do have the Tamron 28-75 and it focuses fine in light, low enough (ISO3200) and hand holdable shutter speeds (sometimes not) without any real issue on a 5DII. I would imagine the 24-70 would be better, from what people tend to say.


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Daan37
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Oct 29, 2011 02:28 |  #8

Depends on the body too. Plus an AF assist light works miracles.


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24-70L low light AF performance
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