The result is blurry and dark, often out of focus .
We keep our focus by concentrating on efforts on the goods and services we are strongest in.
It's easiest to focus on hobbies and favorite interests, although food can also be the focus of the basket.
While Zippy has the attention span of a goldfish, his wife has the focus of an electron microscope.
There is a central hole in the main mirror through which the light passes and is brought to a focus by an eyepiece lens.
The probability for such an event occurring is only significant at the plane of focus , where photon flux is the highest.
These lenses adjust their focus with a patient's eye muscles to give them seamless near or distance vision.
Their focus was always upon the general rather than the particular.
The curve of the meniscus between the fluids can be altered with currents sent through the tube, which changes the focus of the lens.
When a lens is used to focus the sun's rays onto a piece of paper the distance of the paper from the lens is called the focal length.