Pentax smc -FA Operating Manual page 3

Although we have carefully designed these lenses for safe
operation, please pay special attention to items marked with
the following symbols when using this product.
WARNING
CAUTION
USING YOUR LENS SAFETY
This symbol indicates precautions that if not
followed, could result in serious injury to the
user.
This symbol indicates precautions that if not
followed, could result in minor or medium
injury to the user or damage to the equipment.
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