The phrase "a single focal point" is correct and usable in written English.
It can be used when discussing a specific area of focus or concentration in various contexts, such as art, photography, or project management.
Example: "In this design, we aim to create a single focal point that draws the viewer's attention immediately."
Alternatives: "a central focus" or "one main point of interest".
The chapel does not have a single focal point.
If your photographer really likes the look of low light, there is a way to get a fast, quality lens at a reasonable price: skip the zoom lens for a single focal point lens called a "prime" lens.
The word "sound" plays a similar hold-the-fort role in a bizarrely geological account of the German avant-gardist Johannes Kalitzke: "Explosive force generating from a single focal point often serves to integrate diverse facets of sound, causing both compression and extension to occur within each structural layer".
This paper argues that a uniform global tax-like price on carbon emissions, whose revenues each country retains, can provide a focal point for a reciprocal common climate commitment, whereas quantity targets, which do not nearly so readily present such a single focal point, tend to rely ultimately on individual quantity commitments.
CSP arrays do not absorb light but reflect it, concentrating a sliver of the sun's energy onto a single focal point.
"It would be advantageous for the administration to have a single focal point on education, which would then be him.
Right now, there's no single "focal point" for manufacturing-related R&D in the U.S. federal government.
"There is no single focal point for NHS information on adverse events, and at present it is spread across nearly 1,000 different organisations.
A color diagnostic ultrasound system (S2000, Siemens, Germany) was applied, a high-frequency probe of 9L4 was used, and the parameters were set as follows: center frequency of 7.00 MHz; mechanical index of 0.9; continuous irradiation; depth of 3 cm; and single focal point of 1 cm.
Once the performance itself began, it was impossible to look away, even though there was rarely a single focal point movement rippled throughout the stage.
