Pentax 17-70mm - 17-70mm f/4 DA SMC AL IF SDM Lens Operating Manual page 32

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How to use the lens hood with polarizing filter window
1.
Remove the PL filter window cap by sliding it in the direction as shown above.
2.
Turn the outer rim of the circular polarizing filter from the PL filter window as shown above.
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3.
Attach the PL filter window cap.
Memo:
• When shooting, be sure the PL filter window cap is in place to use the lens hood to
maximum effect.