bokeh

plural bokehs · alternative boke

1. uncountableusuallyartsA subjective aesthetic quality of out-of-focus areas of an image projected by a camera lens.

   More expensive lenses usually go down to f/2.8, letting you shoot at faster shutter speeds and get great, creamy bokeh in your background.

   2014, Krista Smith, “What You Need”, in The Right Light: Photographing Children and Families Using Natural Light, Buffalo, N.Y.: Amherst Media, →ISBN, page 13

   2 more examples

   The quality of the out-of-focus area in a wide-aperture image is called bokeh, originally from the Japanese word boke, pronounced bo-keh, which means fuzzy. In photography, bokeh reflects the shape and number of diaphragm blades in the lens, and that determines, in part, the way that out-of-focus points of light are rendered in the image. Bokeh is also a result of spherical aberration that affects how the light is collected. Although subject to controversy, photographers often judge bokeh as being either good or bad. Good bokeh renders the out-of-focus areas as smooth, uniform, and generally circular shapes with nicely blurred edges. Bad bokeh, on the other hand, renders out-of-focus areas with polygonal shapes, hard edges, and with illumination that creates a brighter area at the outside of the disk shape.

   2010, Charlotte K. Lowrie, “Exploring Canon Lenses and Accessories”, in Canon EOS Rebel T2i/550D Digital Field Guide, Indianapolis, Ind.: Wiley Publishing, →ISBN, page 186

   Shooting with natural light, I used a long lens (200mm) to compress the space and slightly blur the background by photographing at a large open aperture (f/2.5). This resulted in gorgeous bokeh, putting the city into a blur while keeping the couple razor sharp.

   2014, Bob Davis, Dawn Davis, “Blackhawks Fans: The Back Story, Posing, Lighting and Lens Selection, Colleagues”, in We’re Engaged!: Photographing Vibrant and Joyful Portraits of the Happy Couple, Buffalo, N.Y.: Amherst Media, →ISBN, pages 102–103