Busting the Lens dictates Focus Speed Myth

Started Mar 22, 2013 | Discussions thread
WilbaW Forum Pro • Posts: 11,549
Re: Busting the Lens dictates Focus Speed Myth

bhollis wrote:

the change in focusing speed when I put a 1.4x TC on my 70-200 f/4L IS is very noticeable.

That would be because the TC alters the relationships between the parameters required to calculate the lens commands. It's very apparent with a short extension tube - focus converges on the target by oscillating between front and back focus, rather than approaching the target from one direction.

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