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CMS-XML EF 500mm f/4L IS USM : How to mount and detach the lens hood.
To attach the hood, loosen the hood locking knob by turning it counterclockwise. Fit the hood onto the lens's hood mount and tighten the locking knob to fix it in place. Use the same procedure in reverse to remove it
CMS-XML EF lens warranty information.
A Product, when delivered to you in new condition in its original container, is warranted against defects in materials or workmanship as follows: for a period of one (1) year from the date of original purchase, defective parts or a defective Product returned to Canon, or its authorized service providers, and proven to be defective upon inspection, will be repaired with new or comparable rebuilt parts or exchanged for a refurbished Product, as determined by Canon or the authorized service provider n their sole discretion.