The phrase "adjustable focus" is correct and usable in written English.
It can be used to describe an optical device, such as a camera or telescope, that allows the user to change the focus to achieve a clearer image.
Example: "The new camera model features an adjustable focus, making it easier to capture sharp images at various distances."
Alternatives: "variable focus" or "modifiable focus".
After many false turns and dead ends, he has succeeded in creating glasses with a mechanically adjustable focus.
People with astigmatism, for instance, an abnormal curve of the cornea, will not be helped much by the adjustable focus.
Although it has a built-in flash, it lacks other tools like a zoom lens or adjustable focus; a $45 camera does have its limits.
"For more than 140 years, adjustable focus has been recognized as the Holy Grail for presbyopes," said Dr. Kurtin, referring to the roughly one-third of the population that has lost some or all ability to focus on close objects.
The Oxford-based company specialises in "adjustable focus eyewear" – glasses that can change their strength at the turn of a dial, depending on what activity you're using them for.
On the back there's a 1.3MP camera with adjustable focus.
This is achieved by using a combination of an electrically adjustable magnetic chicane and a mechanically adjustable focusing chicane.
This month, TruFocals, the company he founded three years ago, has begun selling its first adjustable focusing eyeglasses through a small group of optometrists and will soon sell directly online.
Near-infrared light was generated by a stabilized fan-cooled AvaLight-HAL Tungsten Halogen Light Source (Avantes Inc., Broomfield, CO) with an adjustable focusing connector to maximize light coupling with the source fiber.
By adjusting the ratio of cladding inlet flow rate including Qright/Qleft and Qup/Qdown, we get the adjustable two-dimensional focus direction rather than the one-dimensional focusing.
Once the protons reach top speed, they pass through a device that uses adjustable plates to focus the beam and shape it to the contours of the tumor.
