F = In optics, the f-number (sometimes called focal ratio, f-ratio, or relative aperture) of an optical system expresses the diameter of the entrance pupil in terms of the effective focal length of the lens; in simpler terms, the f-number is the focal length divided by the aperture diameter. It is a dimensionless number that is a quantitative measure of lens speed, an important concept in photography. Depth of field increases with f-number, as illustrated in the photos below:
https://youtu.be/WsVpLUdxYuQ?si=g7Arw3u20MWfKq8q We're back with more VoIP News for April 2025! In this month's episode, we'll…
Growing pains don’t only happen to people, they happen to businesses too! It’s fantastic that…
When looking into new or upgraded IP paging equipment, many people don’t realize that you…
https://youtu.be/Gex7e6jUGSA?si=ts4-9p6JlWS4ZsC8 If you need a rugged, reliable VoIP panel phone that auto-dials with ease, the Viking…
https://youtu.be/FE2kcF7KjgQ?si=inw4thEr2thxgGeL When it comes to security, you should never cut corners. Having something that you…
https://www.youtube.com/watch?v=X2_HXAv73FI Your March VoIP News Update is out now! This month we showcase an awesome…