Ef 200mm j/i.8l – Canon EOS-1 User Manual

Page 29

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EF 200mm J/I.8L

ring is turned, pulse signals are
generated by an encoder that

instructs the microprocessor in the

lens to drive the USM accordingly.
With the EF 200mm f/1.8L, the

EF 300mm f/2.8L, and the EF

600mm f/4L, there’s a 3-step

variable focusing rate, making it pos­
sible to focus rapidly for quick-

moving subjects or to select high-
precision focusing control as the

situation warrants.

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