Using The Built-In Lens Hood - Pentax 26755 - SMC P FA 645 Zoom Lens Operating Manual

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Using the Built-in Lens Hood

To use the built-in lens hood, pull it
out from the lens. In the case of the
FA 600mm f/4 lens, the built-in lens
hood is threaded. To extend or retract
it, turn the hood. For details, see the
FA lens instruction manual.
Lenses with a Built-in Lens Hood
FA 31mm f/1.8AL Limited
FA 77mm f/1.8 Limited
FA 600mm f/4ED (IF)
* Extending the FA 77mm f/1.8's
lens hood does not obstruct the
camera's built-in flash.