Recent Examples of focal length from the Web
The shift from lens width to focal length likely arose in Hollywood for reasons of precision.
The comparison of normal vision with focal length, rather than other forms of measurement, persists because of how lenses came to be produced and used in standard practice.
In the 2016 tests, images were collected through conventional DSLR cameras set up for multiple focal lengths across both the visible and infrared spectra to simulate plenoptic capabilities.
Over time, though, lenses came to be measured by the distance of their focal length.
The ideal lens focal length would be in the 400mm to 600mm range on a 35mm SLR, less on APC cameras with smaller sensors.
The lens was manually focused at infinity, zoomed to a 300 mm focal length, and the camera was set at f/10, 1/250 seconds and ISO-400.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'focal length.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
FOCAL LENGTH Defined for English Language Learners
Definition of focal length for English Language Learners
: the distance from the surface of a lens to the point of focus (sense 3)
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