USM stands for Ultrasonic Autofocus Motor. These lenses offer manual focus override and fast, smooth and comparatively quiet ...

The side by side comparison tool lets you easily view the specifications of two or more cameras. Choose the cameras from the list of the left then press compare. The results will be displayed in a new ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Esophageal manometry, also known as an esophageal motility study, is a test used to diagnose problems involving the movement and function of your esophagus (the tube that runs from your throat to your ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Ask the publishers to restore access to 500,000+ books. An icon used to represent a menu that can be toggled by interacting with this icon. A line drawing of the Internet Archive headquarters building ...