Attaching A Filter And The Dedicated Lens Hood To The Da 21Mm F/3.2 Al Limited Lens - Pentax smc -DA Operating Manual

Attaching a filter and the dedicated lens hood to the DA 21mm f/3.2 AL Limited
lens
It is possible to attach a 49mm diameter filter to the front of the DA 21mm f/3.2 AL Limited
lens, but not when the dedicated lens hood is attached. To use a filter with the dedicated
lens hood, screw a 43mm diameter filter to the back of the filter.
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