Busting the Lens dictates Focus Speed Myth

Started Mar 22, 2013 | Discussions thread
tonyjr
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Re: Busting the Lens dictates Focus Speed Myth
In reply to bhollis, Mar 23, 2013

It is also little things like IS , condition of battery . For second shot - wether pop up flash is used and you are using burst mode . YES , I know the focus is supposed to be locked in burst bot it drifts when pop-up is used .

I have the 18-55 , 18-55 IS and the 17-55 . The 17-55 is the fastest [ especially in low light ] , then the 18-55 IS and then the 18-55 . The 7D focuses faster than the XTI - period .

There is a big difference between the AF speeds of the  180 , 70-200 , 135-400 and the 70-300

If you think there is no difference , try the new 40 mm 2.8 and the older 35 2.8 in low light  . If you see no difference - canon will probably pay big bucks for your camera .

Granted , some of the new lenses have different coatings that could slow down focusing and better focusing could take longer but I have found older lenses do better in manual anyway .

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Canon EOS 400D Canon EOS 7D Canon EF 35mm f/2.0 Canon EF-S 10-22mm f/3.5-4.5 USM Canon EF-S 17-55mm f/2.8 IS USM +14 more
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