Busting the Lens dictates Focus Speed Myth

Started Mar 22, 2013 | Discussions thread
Freneticburn Regular Member • Posts: 200
Re: Busting the Lens dictates Focus Speed Myth

You also have to take into account other factors like the design of the lens, the weight of the elements, etc.  Some lenses go through their distance range with a 90 degree twist while others take 180 degrees or more.  Usually your fast lenses, like 1.2 or 1.4, have the longer twist to fine tune focus better.

I think the lens most certainly determines AF speed but it goes further than if its just USM or not.

 Freneticburn's gear list:Freneticburn's gear list
Canon PowerShot SX260 HS Canon EOS 550D Canon EOS 6D Canon EF 50mm f/1.4 USM Canon EF 135mm F2L USM +3 more
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