focal distance
- noun
- /ˈfoʊkəl ˈdɪstəns/
- Specialized
:
distancia focal
- The microscope's focal distance determines how close the lens must be to the slide for optimal viewing.
So it's not that Holy Grail of having some type of light field display where you can have version accommodation across any focal distance.
- So it's not that Holy Grail of having some type of light field display where you can have version accommodation across any focal distance.
Examples
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The focal distance of its 38-centimeter objective lens was 4.8 meters.
Academic text (1994) -
So it's there's no shortage of those lenses and you can do things like change focus, change focal distance, make your projects that much more versatile.
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Since it is one focal distance away from the lens, I will get a parallel ray bundle.
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Tynan changed the focal distance of this laser.
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Since the focal distance of the transducer is 70 mm, the target is placed in the far field.
Academic text (1997) -
But unlike the MI, MAHLI does not have to move to take images at different focal distances; it just adjusts focus.
Blog text (31) -
My guess is he's looking at the camera, calculating the focal distance and running a table of apertures in his head in order.
Blog text (31) -
Most of the telescopes described were of the open refractor variety, consisting of a large spherically ground lens on a pole and a hand-held eyepiece that the observer chased around with until he had found the focal distance for himself.
Fiction book (1990) -
To achieve a clear image, the photographer adjusted the focal distance of the camera lens.
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Understanding the focal distance is crucial for creating sharp, in-focus images with a camera.
Synonyms
7
5.5
The distance from a lens to the point where parallel light rays meet
How Long
Surface Forms
Morphology
focal + distance
The meaning is directly and predictably built from 'focal' (relating to a focus) plus 'distance' (a measurable separation), yielding 'distance from the focus'. Although it's a technical term used in optics, its adjective+noun composition follows normal English patterns and similar constructions exist cross-linguistically, so a learner who knows both constituents can infer the meaning.
Etymology
Focal distance comes from a simple picture: hold a magnifying glass and move it until the sun's rays meet at a small bright point on paper. The word focal refers to that meeting point and distance is the space to it, so the term means the distance from a lens to the spot 'where the light comes together' or the image is 'sharp'.