Lock in Your Premium Membership Discount!

Join Now
Your content will be up shortly. Please allow up to 5 seconds
F/ Number or F/ Stop
ɛf stap
An f/ stop is a number used to indicate the size of a lens's aperture opening. Aperture blades open and close like the human eye's iris to let in more or less light. A large opening, which lets in more light and is used in darker situations, is described with a small f/ number like f/1.8, and a small opening, which lets in less light and is used in brightly lit scenarios, is described with a large f/ number like f/22.

Workshops Related to F/ Number or F/ Stop Definition

Premium

Headshot Photography 101: Lighting Setup

Lighting setups will vary based on the lighting gear you own (see chapter one of this workshop),...
Free

HDR Photography Workshop: What is a Stop of Light

INTRODUCTION When capturing images manually, a photographer must understand the interactions...
Premium

Lighting 101: HSS vs. ND Filters

HHS vs. ND Filters | Transcription High Speed Sync vs. Neutral Density filters; which is the best...

Related Articles to F/ Number or F/ Stop Definition

Tips & Tricks What Is A Stop Of Light?
By Wendell Weithers on April 7, 2017
There are many concepts in photography that are difficult to wrap your head around, and...
Gear & Apps What’s A T Stop Got To Do With It? | T Stops VS F Stops & When They’re Used
By Holly Roa on December 28, 2016
DSLR video is more prevalent than ever as we sit mere days away from 2017 and as such,...
3 Comments
Insights & Thoughts A Thorough Explanation of the Math Behind F Stops
By Anthony Thurston on August 11, 2013
We all know what f stops are and what they mean, but do you really understand the math...
Previous
External Flash
Next
Fisheye Lens