focal distance


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Related to focal distance: Effective focal length

focal distance

[′fō·kəl ‚dis·təns]
(optics)
References in periodicals archive ?
Then, the sample is located at the focal distance calculated previously and the scanning starts.
In this experiment, the design value of the focal distance is -0.
A previous calibration in air and in a test tank provided correlation rules between raw data and field angle or focal distance.
The seismic stations along the profiles provide seismic records, whereas the data on magnitudes and focal distances are adopted from the following bulletins:
Scripter Liu s wry tone, incorporating a "Psycho"-type switch of protagonists midstream, is well served by helmer Liu's compelling, static compositions, and story's strange perspective seems at one with the camera's startling changes of angle and focal distance.
Although there is usually sufficient latitude, focused grids also experience grid cut off if the grid is not positioned at the intended focal distance.
Several temperature models between 259[degrees]C and 2,981[degrees]C are available with target size ranges between 1 mm and 58 mm diameter at a focal distance of 101 mm to 3,048 mm.
These lenses provide a high index for applications where closer focal distance is required.
Through-the-lens sighting ensures simple 'point and click' operation, with the unit's single lens reflex optics and a circular reticule in the viewfinder displaying the exact target area measured at the fixed focal distance of 4 metres.
If you get so close to an object that its convergence exceeds the alignment limits determined by the focal distance of the system, what should the image do?
Particular emphasis is given to the manner in which the evidence relates to two issues that may well create serious safety hazards and which have been largely neglected in the automotive context: (a) the interaction between HUD focal distance and the perception of outside objects and (b) the capture of visual attention by HUD-projected virtual imagery.
Each features luscious spreads, loaded with visually-interesting details, many of which are too small to pick out readily with the naked eye--but are revealed when the hand lens is applied to the page, provided that the detective can find the proper focal distance that allows the difficult-to-see object to be revealed, while not losing it in a blur of tiny dots that make up the printed picture.

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