Filters OWB Typ 3 Clip-Filter Pentax K

The frame allows the filter to be attached to a connector, a filter holder or in the housing of a camera.

The optical elements are treated with ultra-thin coatings. Among others, there are anti-reflective coatings for reducing, and dielectric coatings for increasing reflection.

No matter whether they are for observing or for astrophotography, filters are very important accessories.