The aperture is an opening in the lens, made by a group of thin metal blades, which controls the amount of light that enters your camera to form an image. The aperture has two main effects on exposure – it alters the amount of your image that appears in focus, and it also affects how long you will need to open the shutter for the correct exposure.
What’s an ‘f’ stop?
The word ‘stop’ comes from the very first cameras. Instead of a diaphragm of blades as used in modern lenses, early photographers had to insert a piece of metal into the lens with a hole drilled through it. This piece of metal was called a stop because it stopped some of the light getting through the lens.
Numbers marked on a lens are sometimes referred to as relative brightness and are expressed as a ratio to one. e.g. 1:2.8 would be f/2.8. The closer to zero the number is, the brighter the aperture.
Why have more blades?
The curvature of the aperture and the number of blades it’s made of has a direct effect on how smooth out-of-focus backgrounds appear. The more blades used the rounder the aperture, leading to smoother background blur, known as bokeh.
Another phenomenon affected by the aperture are diffraction stars. These occur when a strong point source of light is partially obscured in the image. The result is a bright, multi-pointed star radiating from the light source. The number of points on the star is influenced directly by the number of aperture blades. Lenses with an even number of blades create stars with an equal number of points, so a lens with a six-blade diaphragm creates a six pointed star. Apertures made from an odd number of blades create stars with double the number of points. A nine bladed diaphragm creates a beautiful 18 point star.
Online Printing Companies | Online Print Shop Management System | Custom Sticker Printing | Sticker Printing companies | Printing Service | Product Photographer
Albuquerque Printing Company Arizona Printing Company Atlanta Printing Company Austin Printing Company Baltimore Printing Company Boston Printing Company Charlotte Printing Company Chicago Printing Company Cleveland Printing Company Colorado Printing Company Columbus Printing Company Dallas Printing Company Denver Printing Company Detroit Printing Company Houston Printing Company Indianapolis Printing Company Jacksonville Printing Company Kansas City Printing Company Las Vegas Printing Company Los Angeles Printing Company Louisville Printing Company Memphis Printing Company Miami Printing Company Milwaukee Printing Company Minneapolis Printing Company Nashville Printing Company New Orleans Printing Company New York Printing Company Oakland Printing Company Oklahoma City Printing Company Philadelphia Printing Company Phoenix Printing Company Pittsburgh Printing Company Portland Printing Company Sacramento Printing Company San Antonio Printing Company San Diego Printing Company San Francisco Printing Company San Jose Printing Company Seattle Printing Company Washington Printing Company Toronto Printing Company Vancouver Printing Company Calgary Printing Company Edmonton Printing Company Winnipeg Printing Company Ottawa Printing Company Montreal Printing Company Quebec Printing Company St John's Printing Company Saskatoon Printing Company Regina Printing Company
Albuquerque Sticker Printing Arizona Sticker Printing Atlanta Sticker Printing Austin Sticker Printing Baltimore Sticker Printing Boston Sticker Printing Charlotte Sticker Printing Chicago Sticker Printing Cleveland Sticker Printing Colorado Sticker Printing Columbus Sticker Printing Dallas Sticker Printing Denver Sticker Printing Detroit Sticker Printing Houston Sticker Printing Indianapolis Sticker Printing Jacksonville Sticker Printing Kansas City Sticker Printing Las Vegas Sticker Printing Los Angeles Sticker Printing Louisville Sticker Printing Memphis Sticker Printing Miami Sticker Printing Milwaukee Sticker Printing Minneapolis Sticker Printing Nashville Sticker Printing New Orleans Sticker Printing New York Sticker Printing Oakland Sticker Printing Oklahoma City Sticker Printing Philadelphia Sticker Printing Phoenix Sticker Printing Pittsburgh Sticker Printing Portland Sticker Printing Sacramento Sticker Printing San Antonio Sticker Printing San Diego Sticker Printing San Francisco Sticker Printing San Jose Sticker Printing Seattle Sticker Printing Washington Sticker Printing Toronto Sticker Printing Vancouver Sticker Printing Calgary Sticker Printing Edmonton Sticker Printing Winnipeg Sticker Printing Ottawa Sticker Printing Montreal Sticker Printing Quebec Sticker Printing St John's Sticker Printing Saskatoon Sticker Printing Regina Sticker Printing
Albuquerque Sticker Arizona Sticker Atlanta Sticker Austin Sticker Baltimore sticker Boston sticker Charlotte sticker Chicago sticker Cleveland sticker Colorado sticker Columbus sticker Dallas sticker Denver sticker Detroit sticker Houston sticker Indianapolis sticker Jacksonville sticker Kansas City sticker Las Vegas sticker Los Angeles sticker Louisville sticker Memphis sticker Miami sticker Milwaukee sticker Minneapolis sticker Nashville sticker New Orleans sticker New York sticker Oakland sticker Oklahoma City sticker Philadelphia sticker Phoenix sticker Pittsburgh sticker Portland sticker Sacramento sticker San Antonio sticker San Diego sticker San Francisco sticker San Jose sticker Seattle sticker Washington sticker Toronto sticker Vancouver sticker Calgary sticker Edmonton sticker Winnipeg sticker Ottawa sticker Montreal sticker Quebec sticker St John's sticker Saskatoon sticker Regina sticker
Toronto Printing Vancouver Printing Calgary Printing Edmonton Printing Winnipeg Printing Ottawa Printing Montreal Printing Quebec Printing Saskatoon Printing Regina Printing
Albuquerque Sticker Arizona Sticker Atlanta Sticker Austin Sticker Baltimore sticker Boston sticker Charlotte sticker Chicago sticker Cleveland sticker Colorado sticker Columbus sticker Dallas sticker Denver sticker Detroit sticker Houston sticker Indianapolis sticker Jacksonville sticker Kansas City sticker Las Vegas sticker Los Angeles sticker Louisville sticker Memphis sticker Miami sticker Milwaukee sticker Minneapolis sticker Nashville sticker New Orleans sticker New York sticker Oakland sticker Oklahoma City sticker Philadelphia sticker Phoenix sticker Pittsburgh sticker Portland sticker Sacramento sticker San Antonio sticker San Diego sticker San Francisco sticker San Jose sticker Seattle sticker Washington sticker
Print Trade | Print Wholesale | Print Outsource
Add your message
428 MTF tests
74 in-depth photodo reviews
100+ users join each day
Help the lens community by reviewing or rating a lens today via our lens search
- Canon EF 16-35mm f/4 L IS USM Lens Review
- Fujifilm XF 18-135mm f/3.5-5.6 R LM Lens Review
- Canon EF-S 10-18mm f/4.5-5.6 IS STM Lens Review
- Sigma 18-200mm f/3.5-6.4 DC Macro Lens Review
- Tokina AT-X 11-16mm T3 CINE Lens Review
- Tokina Cinema AT-X 16-28mm T/3 Lens Review
- Pentax DA* 60-250mm f/4 ED [IF] SDM Lens Review
- Pentax DA* 50-135mm f/2.8 ED [IF] SDM Review
- Panasonic Leica DG Summilux 15mm f/1.7 Review
- Voigtlander Nokton 58mm f/1.4 SL II Lens Review