### Mm Definition & Meaning

“Millimeter” is a unit of length that equals one-thousandth of a meter. It is a small unit of measurement compared to the centimeter, meter, inches, and feet we are familiar with. Longer focal lengths appear to bring the background closer to what does mm mean the foreground, compressing the scene. Shorter focal lengths appear to increase the space between objects. But changes in perspective and relationship between objects in the scene are also affected by the distance we stand from our subject.

Longer focal lengths are also good for portraits and sports. The main difference in focal lengths is the magnification of your subject. For example, a wide-angle lens/short focal length (under 50mm) is good for taking in the broad span of a landscape, from near to far. They are good for https://www.bookstime.com/ when you want to take in more of a scene. In this activity, you will check your knowledge of how to convert millimeters to other metric units. Also, visit Understanding Fastener Materials and Understanding Fastener Platings and Finishes for more information relating to metric fasteners.

## What Does Wapo Mean? – Meaning, Uses and More

The focal length of a lens is determined when the lens is focused at infinity. As we learned in this lesson, millimeters are a small metric unit for measuring length. They’re useful when measuring small objects, or when measurements need to be more precise than centimeters. A metric ruler or measuring tape is required to measure in millimeters.

Photographing using prime lenses with large apertures also means you can get a shallow depth of field which is useful for portraiture where you might want a softer or blurred background (also known as bokeh). Prime lenses have a fixed focal length and zoom lenses have variable focal lengths. A telephoto lens/long focal length (over 50mm) is good for bringing wildlife up close while allowing you the distance from your subject.