Canon EOS 30D Instruction Manual page 225

1O. Accessories (Sold separately)
Hood
Filters
m-10
The EW-788 II hood can keep unwanted light out of the lens, and also
protects the lens from rain, snow, and dust.
Align the hood's red mark (e) with the attachment position mark on the
lens, then turn it as shown by the arrow to lock it in place.
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Filters can be attached to the lens to control light, or to provide special
effects.
Filters are attached by screwing them into the front of the lens.
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Only one filter may be attached.-
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filter. You cannot use a polarizing filter while the hood is attached to :
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