Busting the Lens dictates Focus Speed Myth

Started Mar 22, 2013 | Discussions thread
Keith Z Leonard Veteran Member • Posts: 6,038
Re: Busting the Lens dictates Focus Speed Myth

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.

 Keith Z Leonard's gear list:Keith Z Leonard's gear list
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 Canon EOS 400D +16 more
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