Assertion: wide open aperture | /r/HasProperty | small f-number
Facets:
Source sentences:
text: A wide open aperture (small f-number) will have a very soft background, with only a small part of the image in focus, while a narrow aperture keeps more of the photo sharp.
text: Be careful when using wide open apertures (small f-numbers), because it is much easier to miss the correct focus point with such a soft depth of field.