Pentax DA 12-24mm F4 Operating Guide

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Attaching the 30.5mm filter to the DA 40mm f/2.8 Limited lens
Normally, you attach the 49mm filter to the front of the lens. But as shown in the diagram,
you can also screw on a 30.5mm filter to the back of the dedicated hood.
About Using a Polarizing Filter 
• If you attach an older type Pentax polarizing filter to the DA 16-45mm f/4 ED AL or DA
18-55mm f/3.5-5.6 AL lens, the dedicated hood cannot be attached over the filter. Also,
the hood might or might not be attachable if a non-Pentax polarizing filter is attached to
the lens.
• Do not attach an older type Pentax polarizing filter to the DA 14mm f/2.8 ED (IF). The filter
will cause vignetting. Instead, use the new Pentax polarizing filter which will not cause
vignetting.