focal distance


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Related to focal distance: Effective focal length

fo·cal dis·tance

the distance from the center of a lens to its focus.

fo·cal dis·tance

(fō'kăl dis'tăns)
The distance from the center of a lens to its focus.

focal distance

In ophthalmology, the distance from the optical center of a lens to the focal point.
See also: distance
References in periodicals archive ?
Caption: Figure 8: Darkness of the newly proposed cavity receiver under different tracking error angles and PTC focal distances.
The results of the focal distance calculated with measuring curvatures by Eq.
This means that in order to obtain an accurate measure of focal distance, a narrow field angle is required.
The seismic stations along the profiles provide seismic records, whereas the data on magnitudes and focal distances are adopted from the following bulletins:
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.
Looking down at the keyboard and back to the screen helps, but for the most part your eyes are always in the same position and at the same focal distance.
The focal distance of the system allows contact-to-noncontact switching with standard 20 mm styli without moving the probe, thus avoiding the need to requalify.
The NIKKOR Z 85mm f/1.8 S makes the most of the Nikon Z mount system's large-diameter mount and short flange focal distance to achieve the polished optical performance required of a portrait lens.
IPCs high power scan heads and fibre lasers can now also be integrated with the firm's in situ Weld Depth Monitor, which provides a comprehensive and direct measurement of crucial processing characteristics, such as weld depth, part fit-up, seam position, undercut, surface porosity and focal distance. Integration of this technology with high power scan heads offers improved remote welding consistency and significant cost savings for applications such as e-mobility seating, powertrain and body-in-white.
Historically, smartphones have been ill-fitted for macro photography because the distance between the lens and the object often exceeds the minimum focal distance. The new camera enables consumers to enjoy true macro performance without splurging for a dedicated macro lens.

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