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FORUMS Cameras, Lenses & Accessories Canon Digital Cameras 
Thread started 18 Feb 2008 (Monday) 00:47
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AF speed in low light USM/micro, Canon/Sigma

 
NOsquid
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Feb 18, 2008 00:47 |  #1

In a thread I was reading someone mentioned that the difference in AF speed on a Canon L versus a Sigma equivalent was particularly evident in low light. Is there a layman's explanation for this?

My understanding is very limited but I thought that the camera determined the focus based on what it sees on the sensor then relayed to the lens what to do. Why would the difference between the two be more significant in low light? The speed of the motors doesn't change does it? Isn't the bottleneck in low light the camera processor trying to figure out what is going on?

Does anyone know if this explanation of AF is accurate?
http://www.fredmiranda​.com/forum/topic2/2280​79/0 (external link)




  
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AF speed in low light USM/micro, Canon/Sigma
FORUMS Cameras, Lenses & Accessories Canon Digital Cameras 
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