70-400G lens

Started Feb 3, 2013 | Discussions thread
quatpat
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Re: 70-400G lens
In reply to Calico Jack, Feb 7, 2013

Calico Jack wrote:

Secondly, any lens with HSM/SSM/USD is essentially a regulator for AF speed, so for fast moving subjects where the focal point changes constantly, a screw-drive lens is superior.

Sorry, but this statement doesn't make much sense at all. I own several long screw-driven lenses and have tried out several HSM/SSM/USD lenses, and my experience is quite the opposite. While the later ar not necessarily quicker in AF-speed, they normally track with smaller increments, which gives a higher AF-precision when tracking.

qp

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