Pentax 21507, 21717, 21740, 21580, 21660, 21650, 21760 manual Filters, Precaution on filters

Make sure the filter size matches the lens, then screw the filter onto the front of the lens.

"Memo:

•The compatible filter size for each lens is listed on pages 46-51.

•Filters cannot be mounted on the DA FISH-EYE 10-17mm f/3.5-4.5ED [IF].

Precaution on filters

•Since a filter becomes a part of the optical system when attached on the lens, handle it in the same way you handle the lens with care to dust, dirt and scratches. Normally, attaching two or more filters on a lens does more harm than good. However, attaching a circular polarizing filter and another filter would not be a problem.

•Use a circular polarizing filter with an autofocus camera for proper exposure and autofocusing.

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 you can also screw a 30.5mm filter to the back of the dedicated hood.