Busting the Lens dictates Focus Speed Myth

Started Mar 22, 2013 | Discussions thread
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Keith Z Leonard
Veteran MemberPosts: 5,292Gear list
Re: Busting the Lens dictates Focus Speed Myth
In reply to Sovern, Mar 23, 2013

Well, having used both, the difference is significant.  I think you are correct that most of the lenses I've used are all just quick, but the 85L is NOT fast, it's actually crazy slow.  I also notice a difference between my 100-400 and my 70-200.  If you think about it, it makes sense that they would be different speeds.  How far the focus ring travels has a lot to do with it, my Sigma 17-50 moves a VERY SMALL amount from closest to infinity focus, put the same motor in a lens that has a lot more focus ring travel and it will be slower.

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Canon EOS 5D Mark III Canon EF 70-200mm f/4.0L USM Canon EF 100-400mm f/4.5-5.6L IS USM Sigma 50mm F1.4 EX DG HSM Canon EF 24-105mm f/4L IS USM +14 more
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