[Demo data — development only. Specifications are illustrative; editorial copy is sample content.]
An f-stop is the ratio of the lens focal length to the aperture opening. Because it's a ratio, smaller numbers mean larger openings — f/1.8 is wide, f/16 is narrow.
Each full stop (f/1.4 → f/2 → f/2.8) halves the light.
M
Written by
Marcus ReidStaff Writer
Marcus writes about technique, education and the business of photography.
Newsletter
The Aperture Daily briefing
Photography news, gear and inspiration — one focused email, no noise. Join thousands of photographers.
No spam. Unsubscribe anytime. See our privacy commitment in our editorial policy.