Panasonic DMC-LX7K Owner's Manual page 204

Others
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When you take pictures using the built-in flash with the filter adaptor installed, the light
from the flash is sometimes blocked by the filter adaptor.
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When installing or removing the filter adaptor, take care not to damage the lens or get
it dirty.
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When installing or removing the thread protector or filter adaptor etc., turn it slowly
and carefully. (If you tighten it too firmly, you may be unable to remove it.)
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When you use the lens cap supplied with the filter adaptor kit, you can install it with
the filter installed.
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Do not attach multiple filters at the same time.
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You can only use filters and cannot attach and use conversion lens, etc. If you attach
a conversion lens, it could cause a camera malfunction. (As of July 2012)
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Refer to the operating instructions of the relevant filters for further details.
Digital Camera Accessory System
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