What is F-Stop and Why is the F-Number of the Lens So Important

An f‑number (ƒ/#) or f‑stop refers to the ratio of a lens’s focal length to its aperture’s diameter (lens opening vs focal length) and indicates the amount of IR energy (heat) coming through the lens to the infrared sensor. The lower the f-number the larger the aperture diameter, meaning more thermal IR energy is reaching the infrared sensor.

What Are F/stops and How Do You Define a Fast Lens?

What is F-Stop, How it Works and How to Use it in Photography

What is f-stop on a camera?, F-stop photography

Solved The f-Stop of a Lens The f-Stop of a Lens The

Aperture F-Numbers and F-Stops - Different But Related Numbers

What is an aperture in cameras? - Quora

The Basics of Photography, PDF, Shutter Speed

In a camera lens, what does an f-number less than one mean? - Quora

How to Use the Settings on Cameras: Shutter Speed, F-Numbers and Exposure - FeltMagnet

DSLR Basics: The 3 Main Camera Settings - Shivani Loves Food

f-number - Wikipedia

What is the difference between focal length and aperture? - Quora

What the f-number!

F/Stop Chart: Everything You Need to Know About F/stops • Pixels and Wanderlust