Can the aperture of the lens impact autofocus points?

3 years 3 months ago #536306 by Monti Leehsu
Quick question as the title asks, if your camera is set a f/2.8, will the number of autofocus points your camera uses, change if you move your camera to f/16 as an example?  


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3 years 3 months ago #536309 by garyrhook
The ability to AF is based on light. Smaller aperture, possibly harder to focus. Depends upon what's coming in, I think. I know that, in dark environments, my lenses that normally focus just fine can have a hard time.

So: not so much the aperture itself, but  rather the impact the aperture has on the situation.

I don't pretend to understand the scientific basis of AF, so I could be way off. Someone will probably be along to add more info.


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3 years 3 months ago #536323 by effron
I haven't noticed any difference, the aperture is fully open when metering anyway, and only stops down upon a shutter button press. (On modern digital bodies)

Why so serious?
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3 years 3 months ago #536327 by Shadowfixer1
It won't impact the number of focus points used. Stopping the lens down on a DSLR shouldn't affect focus since it does all that with the lens wide open and it only stops down when the shutter is triggered.  

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3 years 3 months ago #536336 by Soccer Mom
:agree:  

Canon 7D, 18-55mm, 55-250mm, 70-200mm L f/2.8, 100mm and 17-55mm f/2.8
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3 years 3 months ago #536455 by garyrhook
Oh, very good. I'd forgotten about that. Ignore my previous post.


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