A lens surface with more than one radius of curvature (i.e., the surface does not form part of a sphere). The aspherical elements of a lens help compensate for many lens aberrations common in simpler lens designs. Aspherical elements are particularly important for wide-angle lenses, since they are prone to distortion.
See “A Quick Guide to Digital Cameras” in the Quick Reference section of
A program that translates programs from assembly language to machine language.
All of the files that comprise an application, including the resource, security management, versioning, sharing and deployment information. An assembly may appear as a single DLL or EXE file, or as multiple files, and is roughly the equivalent of a COM module.
- Assembly Language
)A programming language that is once removed from a computer’s machine language. Machine languages consist entirely of numbers and are almost impossible for humans to read and write. Assembly languages have the same structure and set of commands as machine languages, but they enable a programmer to use namesinstead of numbers. Each type of CPU […]
To give a value to a variable. In programming, you assign a value to a variable with a special symbol called an assignment operator. In many languages, the assignment operator is the equal sign (=). For example, the following C language statement assigns the value 5 to the variable x: x = 5 Such a […]
- Assistive Technology
Assistive technology (AT) is a generic term used to refer to a group of software or hardware devices by which people with disabilities can access computers. They can be specially developed and marketed devices or off-the-shelf products that have been modified. Assistive technology can include devices such as alternate keyboards and mice, voice recognition software, […]