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How Fast is Nano USM Compared to STM?

By Canon Rumors | February 18, 2016

In case you missed it, the above video shows the autofocus speed difference between the Nano USM version of the EF-S 18-135mm f/3.5-5.6 IS and the STM version. The difference in this controlled test by Canon is definitely quite obvious.

What will be the first EF lens with Nano USM technology? I think we may find out at NAB in April.

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