focal length
noun
: the distance of a focus from the surface of a lens or curved mirror
Example Sentences
Recent Examples on the Web The Pixel 6a's lens offers an f/1.7 aperture and captures photos at a 27mm focal length. 
PCMAG, 2 Aug. 2022 The Pixel 6 Pro has an extra lens that the Pixel 6a doesn't—a 48MP telephoto camera with a 104mm focal length (4x optical zoom ratio compared with the standard lens). PCMAG, 2 Aug. 2022 For that, Rieth and Atlan worked a lot beforehand, taking photos of each shot with actor doubles and with the right focal length to have the whole film broken down into a succession of images before filming it. Trinidad Barleycorn, Variety, 9 July 2022 For this, use a wide-angle lens, with a focal length from 14 to 24 millimeters, with your camera on a stable tripod. Eric Adams, Popular Mechanics, 15 July 2022 With a focal length of up to 160mm, the Petzval lens was key for flashback scenes. Jazz Tangcay, Variety, 2 July 2022 This means that a 70-millimeter lens would be magnified to a 105-millimeter focal length with a crop factor of 1.5x. Lauren Breedlove, Travel + Leisure, 14 June 2022 Even the multiple lenses solution has big limitations, with full resolution only possible on each camera’s native focal length. David Phelan, Forbes, 14 May 2022 There are three cameras on the new phone, and one of them has a variable focal length, 85-125mm. David Phelan, Forbes, 14 May 2022 See More
PCMAG, 2 Aug. 2022 The Pixel 6 Pro has an extra lens that the Pixel 6a doesn't—a 48MP telephoto camera with a 104mm focal length (4x optical zoom ratio compared with the standard lens). PCMAG, 2 Aug. 2022 For that, Rieth and Atlan worked a lot beforehand, taking photos of each shot with actor doubles and with the right focal length to have the whole film broken down into a succession of images before filming it. Trinidad Barleycorn, Variety, 9 July 2022 For this, use a wide-angle lens, with a focal length from 14 to 24 millimeters, with your camera on a stable tripod. Eric Adams, Popular Mechanics, 15 July 2022 With a focal length of up to 160mm, the Petzval lens was key for flashback scenes. Jazz Tangcay, Variety, 2 July 2022 This means that a 70-millimeter lens would be magnified to a 105-millimeter focal length with a crop factor of 1.5x. Lauren Breedlove, Travel + Leisure, 14 June 2022 Even the multiple lenses solution has big limitations, with full resolution only possible on each camera’s native focal length. David Phelan, Forbes, 14 May 2022 There are three cameras on the new phone, and one of them has a variable focal length, 85-125mm. David Phelan, Forbes, 14 May 2022 See More Word History
First Known Use
1682, in the meaning defined above
Medical Definition
focal length
noun
-ˌleŋ(k)th 
: the distance of a focus from the surface of a lens or concave mirror —symbol f