Assertion: filter's use | /r/HasProperty | required
Facets:
Source sentences:
text: To create ethereal looking landscapes and seascapes with extremely blurred water or other motion, the use of multiple stacked ND filters might be required.
text: Compendiums are also very good when the use of special effects is required (i.e. photo of a bride and groom inside the silhouette of a champagne glass).