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CANON
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EF 600mm f/4L USM
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EF lens warranty information.
Information on the EF II extension tubes.
EF 600mm f/4.0L USM : How to mount and detach the lens hood.
How to locate the serial number on the lens
EF200mm f/1.8L USM : How to use the Focus Preset Function.
How to use the Circular Polarizing Filter PL-C.